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Bergeard N, Hehn M, Mangin S, Lengaigne G, Montaigne F, Lalieu MLM, Koopmans B, Malinowski G. Hot-Electron-Induced Ultrafast Demagnetization in Co/Pt Multilayers. Phys Rev Lett 2016; 117:147203. [PMID: 27740830 DOI: 10.1103/physrevlett.117.147203] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Indexed: 05/23/2023]
Abstract
Using specially engineered structures to tailor the optical absorption in a metallic multilayer, we analyze the magnetization dynamics of a Co/Pt multilayer buried below a thick Cu layer. We demonstrate that hot electrons alone can very efficiently induce ultrafast demagnetization. Simulations based on hot electron ballistic transport implemented within a microscopic model that accounts for local dissipation of angular momentum nicely reproduce the experimental results, ruling out contribution of pure thermal transport.
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Affiliation(s)
- N Bergeard
- Institut Jean Lamour, CNRS UMR 7198, Universitè de Lorraine, 54506 Vandoeuvre-lès-Nancy, France
| | - M Hehn
- Institut Jean Lamour, CNRS UMR 7198, Universitè de Lorraine, 54506 Vandoeuvre-lès-Nancy, France
| | - S Mangin
- Institut Jean Lamour, CNRS UMR 7198, Universitè de Lorraine, 54506 Vandoeuvre-lès-Nancy, France
| | - G Lengaigne
- Institut Jean Lamour, CNRS UMR 7198, Universitè de Lorraine, 54506 Vandoeuvre-lès-Nancy, France
| | - F Montaigne
- Institut Jean Lamour, CNRS UMR 7198, Universitè de Lorraine, 54506 Vandoeuvre-lès-Nancy, France
| | - M L M Lalieu
- Department of Applied Physics, center for NanoMaterials (cNM) Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - B Koopmans
- Department of Applied Physics, center for NanoMaterials (cNM) Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - G Malinowski
- Institut Jean Lamour, CNRS UMR 7198, Universitè de Lorraine, 54506 Vandoeuvre-lès-Nancy, France
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Tao BS, Yang HX, Zuo YL, Devaux X, Lengaigne G, Hehn M, Lacour D, Andrieu S, Chshiev M, Hauet T, Montaigne F, Mangin S, Han XF, Lu Y. Publisher's Note: Long-Range Phase Coherence in Double-Barrier Magnetic Tunnel Junctions with a Large Thick Metallic Quantum Well [Phys. Rev. Lett. 115, 157204 (2015)]. Phys Rev Lett 2015; 115:249903. [PMID: 26705664 DOI: 10.1103/physrevlett.115.249903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Indexed: 06/05/2023]
Abstract
This corrects the article DOI: 10.1103/PhysRevLett.115.157204.
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Tao BS, Yang HX, Zuo YL, Devaux X, Lengaigne G, Hehn M, Lacour D, Andrieu S, Chshiev M, Hauet T, Montaigne F, Mangin S, Han XF, Lu Y. Long-Range Phase Coherence in Double-Barrier Magnetic Tunnel Junctions with a Large Thick Metallic Quantum Well. Phys Rev Lett 2015; 115:157204. [PMID: 26550750 DOI: 10.1103/physrevlett.115.157204] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Indexed: 06/05/2023]
Abstract
Double-barrier heterostructures are model systems for the study of electron tunneling and discrete energy levels in a quantum well (QW). Until now resonant tunneling phenomena in metallic QWs have been observed for limited thicknesses (1-2 nm) under which electron phase coherence is conserved. In the present study we show evidence of QW resonance states in Fe QWs up to 12 nm thick and at room temperature in fully epitaxial double MgAlO_{x} barrier magnetic tunnel junctions. The electron phase coherence displayed in this QW is of unprecedented quality because of a homogenous interface phase shift due to the small lattice mismatch at the Fe-MgAlO_{x} interface. The physical understanding of the critical role of interface strain on QW phase coherence will greatly promote the development of spin-dependent quantum resonant tunneling applications.
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Affiliation(s)
- B S Tao
- Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Institut Jean Lamour, UMR 7198, CNRS-Université de Lorraine, BP239, 54506 Vandœuvre-lès-Nancy, France
| | - H X Yang
- Univ. Grenoble Alpes, INAC-SPINTEC, F-38000 Grenoble, France; CEA, INAC-SPINTEC, F-38000 Grenoble, France and CNRS, SPINTEC, F-38000 Grenoble, France
| | - Y L Zuo
- Institut Jean Lamour, UMR 7198, CNRS-Université de Lorraine, BP239, 54506 Vandœuvre-lès-Nancy, France
| | - X Devaux
- Institut Jean Lamour, UMR 7198, CNRS-Université de Lorraine, BP239, 54506 Vandœuvre-lès-Nancy, France
| | - G Lengaigne
- Institut Jean Lamour, UMR 7198, CNRS-Université de Lorraine, BP239, 54506 Vandœuvre-lès-Nancy, France
| | - M Hehn
- Institut Jean Lamour, UMR 7198, CNRS-Université de Lorraine, BP239, 54506 Vandœuvre-lès-Nancy, France
| | - D Lacour
- Institut Jean Lamour, UMR 7198, CNRS-Université de Lorraine, BP239, 54506 Vandœuvre-lès-Nancy, France
| | - S Andrieu
- Institut Jean Lamour, UMR 7198, CNRS-Université de Lorraine, BP239, 54506 Vandœuvre-lès-Nancy, France
| | - M Chshiev
- Univ. Grenoble Alpes, INAC-SPINTEC, F-38000 Grenoble, France; CEA, INAC-SPINTEC, F-38000 Grenoble, France and CNRS, SPINTEC, F-38000 Grenoble, France
| | - T Hauet
- Institut Jean Lamour, UMR 7198, CNRS-Université de Lorraine, BP239, 54506 Vandœuvre-lès-Nancy, France
| | - F Montaigne
- Institut Jean Lamour, UMR 7198, CNRS-Université de Lorraine, BP239, 54506 Vandœuvre-lès-Nancy, France
| | - S Mangin
- Institut Jean Lamour, UMR 7198, CNRS-Université de Lorraine, BP239, 54506 Vandœuvre-lès-Nancy, France
| | - X F Han
- Beijing National Laboratory of Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Y Lu
- Institut Jean Lamour, UMR 7198, CNRS-Université de Lorraine, BP239, 54506 Vandœuvre-lès-Nancy, France
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Euphrasie S, Vairac P, Cretin B, Lengaigne G. Piezoelectric and optical setup to measure an electrical field: application to the longitudinal near-field generated by a tapered coax. Rev Sci Instrum 2008; 79:034704. [PMID: 18377037 DOI: 10.1063/1.2901543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We propose a new setup to measure an electrical field in one direction. This setup is made of a piezoelectric sintered lead zinconate titanate film and an optical interferometric probe. We used this setup to investigate how the shape of the extremity of a coaxial cable influences the longitudinal electrical near-field generated by it. For this application, we designed our setup to have a spatial resolution of 100 microm in the direction of the electrical field. Simulations and experiments are presented.
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Affiliation(s)
- S Euphrasie
- Institut FEMTO-ST, Université de Franche-Comté, CNRS, ENSMM, 32 av. de l'Observatoire, F-25044 Besançon Cedex, France.
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