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Kowacz M, Mazalski P, Sveklo I, Matczak M, Anastaziak B, Guzowska U, Dhiman AK, Madej E, Maziewski A, Kuświk P, Gieniusz R. Strong interfacial Dzyaloshinskii-Moriya induced in Co due to contact with NiO. Sci Rep 2022; 12:12741. [PMID: 35882888 PMCID: PMC9325689 DOI: 10.1038/s41598-022-16997-4] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Accepted: 07/19/2022] [Indexed: 11/09/2022] Open
Abstract
The magnetic properties of NiO/Co/Pt as a function of Co layer thickness were investigated by polar magneto-optical Kerr effect (PMOKE) (magnetometry and microscopy) and Brillouin Light Scattering (BLS) spectroscopy. PMOKE measurements revealed strong surface anisotropy (1.8 mJ/m2) favoring perpendicular magnetic anisotropy and asymmetric domain wall propagation explained by anticlockwise chirality. BLS measurements show that this chirality is induced by strong interfacial Dzyaloshinskii-Moriya interaction (+ 2.0 pJ/m). This is one of the highest values reported so far for Co layers surrounded by different layers. The observed chirality is opposite to what has been found in Co/oxide interfaces. These results and data published earlier, indicate that the strength of interfacial Dzyaloshinskii-Moriya interaction increases with the amount of stoichiometric NiO. Therefore, this work shows that NiO is the source of the interfacial Dzyaloshinskii-Moriya interaction.
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Affiliation(s)
- M Kowacz
- Institute of Molecular Physics Polish Academy of Sciences, Poznań, Poland
| | - P Mazalski
- Faculty of Physics, University of Bialystok, Białystok, Poland. .,Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Kraków, Poland.
| | - I Sveklo
- Faculty of Physics, University of Bialystok, Białystok, Poland
| | - M Matczak
- Faculty of Physics, University of Bialystok, Białystok, Poland
| | - B Anastaziak
- Institute of Molecular Physics Polish Academy of Sciences, Poznań, Poland.,NanoBioMedical Centre, Adam Mickiewicz University in Poznan, Poznań, Poland
| | - U Guzowska
- Faculty of Physics, University of Bialystok, Białystok, Poland
| | - A K Dhiman
- Faculty of Physics, University of Bialystok, Białystok, Poland
| | - E Madej
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Kraków, Poland
| | - A Maziewski
- Faculty of Physics, University of Bialystok, Białystok, Poland
| | - P Kuświk
- Institute of Molecular Physics Polish Academy of Sciences, Poznań, Poland.
| | - R Gieniusz
- Faculty of Physics, University of Bialystok, Białystok, Poland
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Jakubowski MM, Liedke MO, Butterling M, Dynowska E, Sveklo I, Milińska E, Kurant Z, Böttger R, von Borany J, Maziewski A, Wagner A, Wawro A. On defects' role in enhanced perpendicular magnetic anisotropy in Pt/Co/Pt, induced by ion irradiation. J Phys Condens Matter 2019; 31:185801. [PMID: 30699388 DOI: 10.1088/1361-648x/ab0351] [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: 06/09/2023]
Abstract
Modifications of magnetic and magneto-optical properties of Pt/Co(d Co )/Pt upon Ar+ irradiation (with energy 1.2, 5 and 30 keV) and fluence, F at the range from 2 · 1013-2 · 1016 Ar+ cm-2) were studied. Two 'branches' of increased perpendicular magnetic anisotropy (PMA) and enhanced magneto-optical response are found on 2D (d Co , F) diagrams. The difference in F between 'branches' is driven by ion energy. Structural features correlated with magnetic properties have been analysed thoroughly by x-ray diffraction, Rutherford backscattering spectrometry and positron annihilation spectroscopy. Experimental results are in agreement with TRIDYN numerical calculations of irradiation-induced layers intermixing. Our work discusses particularly structural factors related to crystal lattice defects and strain, created and modified by irradiation, co-responsible for the increase in the PMA.
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Affiliation(s)
- M M Jakubowski
- Institute of Physics, Polish Academy of Sciences, Warsaw, Poland
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Amemiya K, Sakamaki M, Mazalski P, Sveklo I, Kurant Z, Maziewski A, Liedke MO, Fassbender J, Wawro A, Baczewski LT. Ga +ion irradiation-induced changes in magnetic anisotropy of a Pt/Co/Pt thin film studied by X-ray magnetic circular dichroism. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20134008002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Bozovic I, Logvenov G, Belca I, Narimbetov B, Sveklo I. Epitaxial strain and superconductivity in La2-xSrxCuO4 thin films. Phys Rev Lett 2002; 89:107001. [PMID: 12225215 DOI: 10.1103/physrevlett.89.107001] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2002] [Indexed: 05/23/2023]
Abstract
The report that T(c) was doubled in underdoped La2-xSrxCuO4 films under compressive epitaxial strain has stirred great interest. We show that such films are extremely sensitive to oxygen intake, even at very low temperature, with startling consequences including colossal lattice expansion and a crossover from semiconductor to metallic behavior. We can bring T(c) up to 40 K in La2CuO4 films on SrTiO3 substrates-without any Sr doping and under tensile strain. On LaSrAlO4 substrates, we reached T(c)=51.5 K, the highest so far in La2-xSrxCuO4.
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Affiliation(s)
- I Bozovic
- Oxxel GmbH, Technologiepark Universitaet, Bremen D-28359, Germany.
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