1
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Seifert TS, Martens U, Radu F, Ribow M, Berritta M, Nádvorník L, Starke R, Jungwirth T, Wolf M, Radu I, Münzenberg M, Oppeneer PM, Woltersdorf G, Kampfrath T. Frequency-Independent Terahertz Anomalous Hall Effect in DyCo 5 , Co 32 Fe 68 , and Gd 27 Fe 73 Thin Films from DC to 40 THz. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2007398. [PMID: 33656190 DOI: 10.1002/adma.202007398] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 12/21/2020] [Indexed: 06/12/2023]
Abstract
The anomalous Hall effect (AHE) is a fundamental spintronic charge-to-charge-current conversion phenomenon and closely related to spin-to-charge-current conversion by the spin Hall effect. Future high-speed spintronic devices will crucially rely on such conversion phenomena at terahertz (THz) frequencies. Here, it is revealed that the AHE remains operative from DC up to 40 THz with a flat frequency response in thin films of three technologically relevant magnetic materials: DyCo5 , Co32 Fe68 , and Gd27 Fe73 . The frequency-dependent conductivity-tensor elements σxx and σyx are measured, and good agreement with DC measurements is found. The experimental findings are fully consistent with ab initio calculations of σyx for CoFe and highlight the role of the large Drude scattering rate (≈100 THz) of metal thin films, which smears out any sharp spectral features of the THz AHE. Finally, it is found that the intrinsic contribution to the THz AHE dominates over the extrinsic mechanisms for the Co32 Fe68 sample. The results imply that the AHE and related effects such as the spin Hall effect are highly promising ingredients of future THz spintronic devices reliably operating from DC to 40 THz and beyond.
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Affiliation(s)
- Tom S Seifert
- Department of Physics, Freie Universität Berlin, Berlin, 14195, Germany
- Department of Physical Chemistry, Fritz-Haber-Institute of the Max-Planck-Society, Berlin, 14195, Germany
| | - Ulrike Martens
- Institute of Physics, University of Greifswald, Greifswald, 17489, Germany
| | - Florin Radu
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, Berlin, 12489, Germany
| | - Mirkow Ribow
- Institute of Physics, Martin-Luther Universität Halle-Wittenberg, Halle (Saale), 06120, Germany
| | - Marco Berritta
- Department of Physics and Astronomy, Uppsala University, P.O. Box 516, Uppsala, SE-75120, Sweden
| | - Lukáš Nádvorník
- Faculty of Mathematics and Physics, Charles University, Ke Kalovu 2027/3, Prague, 12116, Czech Republic
| | | | - Tomas Jungwirth
- Institute of Physics, Czech Academy of Sciences, Cukrovarnicka 10, Praha, 6, 162 00, Czech Republic
- School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, UK
| | - Martin Wolf
- Department of Physical Chemistry, Fritz-Haber-Institute of the Max-Planck-Society, Berlin, 14195, Germany
| | - Ilie Radu
- Department of Physics, Freie Universität Berlin, Berlin, 14195, Germany
- Max-Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Str. 2A, Berlin, 12489, Germany
| | - Markus Münzenberg
- Institute of Physics, University of Greifswald, Greifswald, 17489, Germany
| | - Peter M Oppeneer
- Institute of Physics, Martin-Luther Universität Halle-Wittenberg, Halle (Saale), 06120, Germany
| | - Georg Woltersdorf
- Institute of Physics, Martin-Luther Universität Halle-Wittenberg, Halle (Saale), 06120, Germany
| | - Tobias Kampfrath
- Department of Physics, Freie Universität Berlin, Berlin, 14195, Germany
- Department of Physical Chemistry, Fritz-Haber-Institute of the Max-Planck-Society, Berlin, 14195, Germany
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2
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Salemi L, Berritta M, Nandy AK, Oppeneer PM. Orbitally dominated Rashba-Edelstein effect in noncentrosymmetric antiferromagnets. Nat Commun 2019; 10:5381. [PMID: 31772174 PMCID: PMC6879646 DOI: 10.1038/s41467-019-13367-z] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2019] [Accepted: 11/05/2019] [Indexed: 11/09/2022] Open
Abstract
Efficient manipulation of magnetic order with electric current pulses is desirable for achieving fast spintronic devices. The Rashba-Edelstein effect, wherein spin polarization is electrically induced in noncentrosymmetric systems, provides a mean to achieve staggered spin-orbit torques. Initially predicted for spin, its orbital counterpart has been disregarded up to now. Here we report a generalized Rashba-Edelstein effect, which generates not only spin polarization but also orbital polarization, which we find to be far from being negligible. We show that the orbital Rashba-Edelstein effect does not require spin-orbit coupling to exist. We present first-principles calculations of the frequency-dependent spin and orbital Rashba-Edelstein tensors for the noncentrosymmetric antiferromagnets CuMnAs and Mn[Formula: see text]Au. We show that the electrically induced local magnetization can exhibit Rashba-like or Dresselhaus-like symmetries, depending on the magnetic configuration. We compute sizable induced magnetizations at optical frequencies, which suggest that electric-field driven switching could be achieved at much higher frequencies.
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Affiliation(s)
- Leandro Salemi
- Department of Physics and Astronomy, Uppsala University, P. O. Box 516, S-751 20, Uppsala, Sweden.
| | - Marco Berritta
- Department of Physics and Astronomy, Uppsala University, P. O. Box 516, S-751 20, Uppsala, Sweden
| | - Ashis K Nandy
- Department of Physics and Astronomy, Uppsala University, P. O. Box 516, S-751 20, Uppsala, Sweden.,School of Physical Sciences, National Institute of Science Education and Research, HBNI, Jatni, 752050, Odisha, India
| | - Peter M Oppeneer
- Department of Physics and Astronomy, Uppsala University, P. O. Box 516, S-751 20, Uppsala, Sweden.
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3
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Wu M, Li Z, Cao T, Louie SG. Physical origin of giant excitonic and magneto-optical responses in two-dimensional ferromagnetic insulators. Nat Commun 2019; 10:2371. [PMID: 31147561 PMCID: PMC6542836 DOI: 10.1038/s41467-019-10325-7] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Accepted: 04/30/2019] [Indexed: 11/09/2022] Open
Abstract
The recent discovery of magnetism in atomically thin layers of van der Waals crystals has created great opportunities for exploring light–matter interactions and magneto-optical phenomena in the two-dimensional limit. Optical and magneto-optical experiments have provided insights into these topics, revealing strong magnetic circular dichroism and giant Kerr signals in atomically thin ferromagnetic insulators. However, the nature of the giant magneto-optical responses and their microscopic mechanism remain unclear. Here, by performing first-principles GW and Bethe-Salpeter equation calculations, we show that excitonic effects dominate the optical and magneto-optical responses in the prototypical two-dimensional ferromagnetic insulator, CrI3. We simulate the Kerr and Faraday effects in realistic experimental setups, and based on which we predict the sensitive frequency- and substrate-dependence of magneto-optical responses. These findings provide physical understanding of the phenomena as well as potential design principles for engineering magneto-optical and optoelectronic devices using two-dimensional magnets. The magneto-optical (MO) effects probe the electronic and magnetic properties of a material, particularly useful for 2D magnets. Here, the authors show that the large optical and MO responses in ferromagnetic monolayer CrI3 arise from strongly bound excitons, extending over several atoms.
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Affiliation(s)
- Meng Wu
- Department of Physics, University of California at Berkeley, Berkeley, CA, 94720, USA.,Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Zhenglu Li
- Department of Physics, University of California at Berkeley, Berkeley, CA, 94720, USA.,Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Ting Cao
- Department of Physics, University of California at Berkeley, Berkeley, CA, 94720, USA.,Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Steven G Louie
- Department of Physics, University of California at Berkeley, Berkeley, CA, 94720, USA. .,Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.
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4
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Polarization Analysis in Mössbauer Reflectometry with Synchrotron Mössbauer Source. CONDENSED MATTER 2019. [DOI: 10.3390/condmat4010008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Polarization selection of the reflected radiation has been employed in Mössbauer reflectivity measurements with a synchrotron Mössbauer source (SMS). The polarization of resonantly scattered radiation differs from the polarization of an incident wave so the Mössbauer reflectivity contains a scattering component with 90° rotated polarization relative to the π-polarization of the SMS for some hyperfine transitions. We have shown that the selection of this rotated π→σ component from total reflectivity gives an unusual angular dependence of reflectivity characterized by a peak near the critical angle of the total external reflection. In the case of collinear antiferromagnetic interlayer ordering, the “magnetic” maxima on the reflectivity angular curve are formed practically only by radiation with this rotated polarization. The first experiment on Mössbauer reflectivity with a selection of the rotated polarization discovers the predicted peak near the critical angle. The measurement of the rotated π→σ polarization component in Mössbauer reflectivity spectra excludes the interference with non-resonant electronic scattering and simplifies the spectrum shape near the critical angle allowing for an improved data interpretation in the case of poorly resolved spectra. It is shown that the selected component of Mössbauer reflectivity with rotated polarization is characterized by enhanced surface sensitivity, determined by the “squared standing waves” depth dependence. Therefore, the new approach has interesting perspectives for investigations of surfaces, ultrathin layers and multilayers having complicated magnetic structures.
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5
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Higo T, Man H, Gopman DB, Wu L, Koretsune T, van ’t Erve OMJ, Kabanov YP, Rees D, Li Y, Suzuki MT, Patankar S, Ikhlas M, Chien CL, Arita R, Shull RD, Orenstein J, Nakatsuji S. Large magneto-optical Kerr effect and imaging of magnetic octupole domains in an antiferromagnetic metal. NATURE PHOTONICS 2018; 12:73-78. [PMID: 29910828 PMCID: PMC5997294 DOI: 10.1038/s41566-017-0086-z] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Accepted: 12/13/2017] [Indexed: 05/15/2023]
Abstract
When a polarized light beam is incident upon the surface of a magnetic material, the reflected light undergoes a polarization rotation1. This magneto-optical Kerr effect (MOKE) has been intensively studied in a variety of ferro- and ferrimagnetic materials because it provides a powerful probe for electronic and magnetic properties2, 3 as well as for various applications including magneto-optical recording4. Recently, there has been a surge of interest in antiferromagnets (AFMs) as prospective spintronic materials for high-density and ultrafast memory devices, owing to their vanishingly small stray field and orders of magnitude faster spin dynamics compared to their ferromagnetic counterparts5-9. In fact, the MOKE has proven useful for the study and application of the antiferromagnetic (AF) state. Although limited to insulators, certain types of AFMs are known to exhibit a large MOKE, as they are weak ferromagnets due to canting of the otherwise collinear spin structure10-14. Here we report the first observation of a large MOKE signal in an AF metal at room temperature. In particular, we find that despite a vanishingly small magnetization of M ~0.002 µB/Mn, the non-collinear AF metal Mn3Sn15 exhibits a large zero-field MOKE with a polar Kerr rotation angle of 20 milli-degrees, comparable to ferromagnetic metals. Our first-principles calculations have clarified that ferroic ordering of magnetic octupoles in the non-collinear Néel state16 may cause a large MOKE even in its fully compensated AF state without spin magnetization. This large MOKE further allows imaging of the magnetic octupole domains and their reversal induced by magnetic field. The observation of a large MOKE in an AF metal should open new avenues for the study of domain dynamics as well as spintronics using AFMs.
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Affiliation(s)
- Tomoya Higo
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
- CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
| | - Huiyuan Man
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Daniel B. Gopman
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| | - Liang Wu
- Department of Physics, University of California, Berkeley, California 94720, USA
- Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
- Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Takashi Koretsune
- CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
- Department of Physics, Tohoku University, Sendai, Miyagi 980-8578, Japan
- RIKEN-CEMS, Wako, Saitama 351-0198, Japan
| | - Olaf M. J. van ’t Erve
- Materials Science and Technology Division, U.S. Naval Research Laboratory, Washington, DC 20375, USA
| | - Yury P. Kabanov
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
- Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow Region 142432, Russia
| | - Dylan Rees
- Department of Physics, University of California, Berkeley, California 94720, USA
- Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Yufan Li
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Michi-To Suzuki
- CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
- RIKEN-CEMS, Wako, Saitama 351-0198, Japan
| | - Shreyas Patankar
- Department of Physics, University of California, Berkeley, California 94720, USA
- Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Muhammad Ikhlas
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
- CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
| | - C. L. Chien
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Ryotaro Arita
- CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
- RIKEN-CEMS, Wako, Saitama 351-0198, Japan
| | - Robert D. Shull
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| | - Joseph Orenstein
- Department of Physics, University of California, Berkeley, California 94720, USA
- Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Satoru Nakatsuji
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
- CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
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6
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Measurement of the Resonant Magneto-Optical Kerr Effect Using a Free Electron Laser. APPLIED SCIENCES-BASEL 2017. [DOI: 10.3390/app7070662] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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7
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Mondal R, Berritta M, Oppeneer PM. Signatures of relativistic spin-light coupling in magneto-optical pump-probe experiments. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:194002. [PMID: 28337969 DOI: 10.1088/1361-648x/aa68ea] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Femtosecond magneto-optical pump-probe measurements of ultrafast demagnetization show an intriguing difference in the first 100 fs of the magneto-optical Kerr response depending on whether the polarization of the pump and probe beams are in parallel or perpendicular configuration (Bigot et al 2009 Nat. Phys. 5 515). Starting from a most general relativistic Hamiltonian we focus on the ultra-relativistic light-spin interaction and show that this coupling term leads to different light-induced opto-magnetic fields when pump and probe polarization are parallel and perpendicular to each other, providing thus an explanation for the measurements. We also analyze other pump-probe configurations where the pump laser is circularly polarized and the employed probe contains only linearly polarized light and show that similar opto-magnetic effects can be anticipated.
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Affiliation(s)
- Ritwik Mondal
- Department of Physics and Astronomy, Uppsala University, PO Box 516, Uppsala, SE-75120, Sweden
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8
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Carva K, Baláž P, Radu I. Laser-Induced Ultrafast Magnetic Phenomena. HANDBOOK OF MAGNETIC MATERIALS 2017. [DOI: 10.1016/bs.hmm.2017.09.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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9
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Fan T, Grychtol P, Knut R, Hernández-García C, Hickstein DD, Zusin D, Gentry C, Dollar FJ, Mancuso CA, Hogle CW, Kfir O, Legut D, Carva K, Ellis JL, Dorney KM, Chen C, Shpyrko OG, Fullerton EE, Cohen O, Oppeneer PM, Milošević DB, Becker A, Jaroń-Becker AA, Popmintchev T, Murnane MM, Kapteyn HC. Bright circularly polarized soft X-ray high harmonics for X-ray magnetic circular dichroism. Proc Natl Acad Sci U S A 2015; 112:14206-11. [PMID: 26534992 PMCID: PMC4655510 DOI: 10.1073/pnas.1519666112] [Citation(s) in RCA: 211] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
We demonstrate, to our knowledge, the first bright circularly polarized high-harmonic beams in the soft X-ray region of the electromagnetic spectrum, and use them to implement X-ray magnetic circular dichroism measurements in a tabletop-scale setup. Using counterrotating circularly polarized laser fields at 1.3 and 0.79 µm, we generate circularly polarized harmonics with photon energies exceeding 160 eV. The harmonic spectra emerge as a sequence of closely spaced pairs of left and right circularly polarized peaks, with energies determined by conservation of energy and spin angular momentum. We explain the single-atom and macroscopic physics by identifying the dominant electron quantum trajectories and optimal phase-matching conditions. The first advanced phase-matched propagation simulations for circularly polarized harmonics reveal the influence of the finite phase-matching temporal window on the spectrum, as well as the unique polarization-shaped attosecond pulse train. Finally, we use, to our knowledge, the first tabletop X-ray magnetic circular dichroism measurements at the N4,5 absorption edges of Gd to validate the high degree of circularity, brightness, and stability of this light source. These results demonstrate the feasibility of manipulating the polarization, spectrum, and temporal shape of high harmonics in the soft X-ray region by manipulating the driving laser waveform.
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Affiliation(s)
- Tingting Fan
- Department of Physics and JILA, University of Colorado, Boulder, CO 80309-0440;
| | - Patrik Grychtol
- Department of Physics and JILA, University of Colorado, Boulder, CO 80309-0440
| | - Ronny Knut
- Department of Physics and JILA, University of Colorado, Boulder, CO 80309-0440
| | - Carlos Hernández-García
- Department of Physics and JILA, University of Colorado, Boulder, CO 80309-0440; Grupo de Investigación en Óptica Extrema, Universidad de Salamanca, Salamanca 37008, Spain
| | - Daniel D Hickstein
- Department of Physics and JILA, University of Colorado, Boulder, CO 80309-0440
| | - Dmitriy Zusin
- Department of Physics and JILA, University of Colorado, Boulder, CO 80309-0440
| | - Christian Gentry
- Department of Physics and JILA, University of Colorado, Boulder, CO 80309-0440
| | - Franklin J Dollar
- Department of Physics and JILA, University of Colorado, Boulder, CO 80309-0440
| | | | - Craig W Hogle
- Department of Physics and JILA, University of Colorado, Boulder, CO 80309-0440
| | - Ofer Kfir
- Solid State Institute and Physics Department, Technion, Haifa 32000, Israel
| | - Dominik Legut
- IT4Innovations Center, VSB Technical University of Ostrava, CZ 708 33 Ostrava, Czech Republic; Faculty of Mathematics and Physics, Department of Condensed Matter Physics, Charles University in Prague, CZ-12116 Prague 2, Czech Republic
| | - Karel Carva
- Faculty of Mathematics and Physics, Department of Condensed Matter Physics, Charles University in Prague, CZ-12116 Prague 2, Czech Republic; Department of Physics and Astronomy, Uppsala University, 75120 Uppsala, Sweden
| | - Jennifer L Ellis
- Department of Physics and JILA, University of Colorado, Boulder, CO 80309-0440
| | - Kevin M Dorney
- Department of Physics and JILA, University of Colorado, Boulder, CO 80309-0440
| | - Cong Chen
- Department of Physics and JILA, University of Colorado, Boulder, CO 80309-0440
| | - Oleg G Shpyrko
- Department of Physics, University of California San Diego, La Jolla, CA 92093
| | - Eric E Fullerton
- Center for Magnetic Recording Research, University of California San Diego, La Jolla, CA 92093-0401
| | - Oren Cohen
- Solid State Institute and Physics Department, Technion, Haifa 32000, Israel
| | - Peter M Oppeneer
- Department of Physics and Astronomy, Uppsala University, 75120 Uppsala, Sweden
| | - Dejan B Milošević
- Faculty of Science, University of Sarajevo, 71000 Sarajevo, Bosnia and Herzegovina; Academy of Sciences and Arts of Bosnia and Herzegovina, 71000 Sarajevo, Bosnia and Herzegovina; Max-Born-Institut, 12489 Berlin, Germany
| | - Andreas Becker
- Department of Physics and JILA, University of Colorado, Boulder, CO 80309-0440
| | | | - Tenio Popmintchev
- Department of Physics and JILA, University of Colorado, Boulder, CO 80309-0440
| | - Margaret M Murnane
- Department of Physics and JILA, University of Colorado, Boulder, CO 80309-0440;
| | - Henry C Kapteyn
- Department of Physics and JILA, University of Colorado, Boulder, CO 80309-0440
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10
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Yamamoto S, Taguchi M, Someya T, Kubota Y, Ito S, Wadati H, Fujisawa M, Capotondi F, Pedersoli E, Manfredda M, Raimondi L, Kiskinova M, Fujii J, Moras P, Tsuyama T, Nakamura T, Kato T, Higashide T, Iwata S, Yamamoto S, Shin S, Matsuda I. Ultrafast spin-switching of a ferrimagnetic alloy at room temperature traced by resonant magneto-optical Kerr effect using a seeded free electron laser. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2015; 86:083901. [PMID: 26329205 DOI: 10.1063/1.4927828] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Ultrafast magnetization reversal of a ferrimagnetic metallic alloy GdFeCo was investigated by time-resolved resonant magneto-optical Kerr effect measurements using a seeded free electron laser. The GdFeCo alloy was pumped by a linearly polarized optical laser pulse, and the following temporal evolution of the magnetization of Fe in GdFeCo was element-selectively traced by a probe free electron laser pulse with a photon energy tuned to the Fe M-edge. The results have been measured using rotating analyzer ellipsometry method and confirmed magnetization switching caused by ultrafast heating.
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Affiliation(s)
- Sh Yamamoto
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - M Taguchi
- Nara Institute of Science and Technology (NAIST), Ikoma, Nara 630-0192, Japan
| | - T Someya
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - Y Kubota
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - S Ito
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - H Wadati
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - M Fujisawa
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - F Capotondi
- Elettra-Sincrotrone Trieste, SS 14 - km 163.5, I-34149 Basovizza, Trieste, Italy
| | - E Pedersoli
- Elettra-Sincrotrone Trieste, SS 14 - km 163.5, I-34149 Basovizza, Trieste, Italy
| | - M Manfredda
- Elettra-Sincrotrone Trieste, SS 14 - km 163.5, I-34149 Basovizza, Trieste, Italy
| | - L Raimondi
- Elettra-Sincrotrone Trieste, SS 14 - km 163.5, I-34149 Basovizza, Trieste, Italy
| | - M Kiskinova
- Elettra-Sincrotrone Trieste, SS 14 - km 163.5, I-34149 Basovizza, Trieste, Italy
| | - J Fujii
- Laboratorio TASC, Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche, I-34012 Basovizza, Trieste, Italy
| | - P Moras
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Trieste, Italy
| | - T Tsuyama
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - T Nakamura
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - T Kato
- Department of Electrical Engineering and Computer Science, Nagoya University, Chikusa, Nagoya 464-8603, Japan
| | - T Higashide
- Department of Electrical Engineering and Computer Science, Nagoya University, Chikusa, Nagoya 464-8603, Japan
| | - S Iwata
- Division of Integrated Research Projects, EcoTopia Science Institute, Nagoya University, Chikusa, Nagoya 464-8603, Japan
| | - S Yamamoto
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - S Shin
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - I Matsuda
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
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11
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Levallois J, Nedoliuk IO, Crassee I, Kuzmenko AB. Magneto-optical Kramers-Kronig analysis. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2015; 86:033906. [PMID: 25832244 DOI: 10.1063/1.4914846] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We describe a simple magneto-optical experiment and introduce a magneto-optical Kramers-Kronig analysis (MOKKA) that together allow extracting the complex dielectric function for left- and right-handed circular polarizations in a broad range of frequencies without actually generating circularly polarized light. The experiment consists of measuring reflectivity and Kerr rotation, or alternatively transmission and Faraday rotation, at normal incidence using only standard broadband polarizers without retarders or quarter-wave plates. In a common case, where the magneto-optical rotation is small (below ∼0.2 rad), a fast measurement protocol can be realized, where the polarizers are fixed at 45(∘) with respect to each other. Apart from the time-effectiveness, the advantage of this protocol is that it can be implemented at ultra-high magnetic fields and in other situations, where an in-situ polarizer rotation is difficult. Overall, the proposed technique can be regarded as a magneto-optical generalization of the conventional Kramers-Kronig analysis of reflectivity on bulk samples and the Kramers-Kronig constrained variational analysis of more complex types of spectral data. We demonstrate the application of this method to the textbook semimetals bismuth and graphite and also use it to obtain handedness-resolved magneto-absorption spectra of graphene on SiC.
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Affiliation(s)
- Julien Levallois
- Department of Quantum Matter Physics, University of Geneva, CH-1211 Geneva 4, Switzerland
| | - Ievgeniia O Nedoliuk
- Department of Quantum Matter Physics, University of Geneva, CH-1211 Geneva 4, Switzerland
| | - Iris Crassee
- Department of Quantum Matter Physics, University of Geneva, CH-1211 Geneva 4, Switzerland
| | - Alexey B Kuzmenko
- Department of Quantum Matter Physics, University of Geneva, CH-1211 Geneva 4, Switzerland
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Andreev IV, Tchougréeff AL, Kögerler P, Rai RC. Magneto-optical Response of 3 d-Decorated Polyoxomolybdates with ε-Keggin Structure. Inorg Chem 2014; 53:2892-8. [DOI: 10.1021/ic402645g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- I. V. Andreev
- Department
of Chemistry, Moscow State University, 119991 Moscow, Russia
| | - A. L. Tchougréeff
- Department
of Chemistry, Moscow State University, 119991 Moscow, Russia
- Institut
für Anorganische Chemie, RWTH−Aachen University, Landoltweg,
1, Aachen, D-52074, Germany
- Poncelet Laboratory, Moscow Center for
Continuous Mathematical Education, Moscow Independent University, 119002 Moscow, Russia
| | - P. Kögerler
- Institut
für Anorganische Chemie, RWTH−Aachen University, Landoltweg,
1, Aachen, D-52074, Germany
| | - R. C. Rai
- Physics
Department, Buffalo State College, 1300 Elmwood Avenue, Buffalo, New York 14222, United States
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