Abstract
We observed a temperature-controlled increase in the magnetic anisotropy and its dispersion in thin GaMnSb films with MnSb nanoinclusions obtained by pulsed laser deposition. The data of transmission electron microscopy indicate that in the samples, a transition of the crystalline structure of magnetic MnSb nanoinclusions from hexagonal (spatial group (sp. gr.) P63/mmc) to cubic (sp. gr. F-43m) takes place. Analysis of the temperature dependences of the magnetic moment m(T), measured using a SQUID magnetometer, obtained for both unannealed and annealed samples cooled in a zero magnetic field and a magnetic field of 10 kOe, indicates that this mechanism is not unique. In unannealed samples, the distribution of the magnetic anisotropy of MnSb nanoinclusions, determined from the dependences of m(T), is unimodal. In the annealed samples, the same dependence becomes multimodal. This means that several thermally activated processes occur in the samples during annealing, resulting in several “populations” of nanoinclusions present in the annealed thin films. The contribution to the increase in the magnetic anisotropy during annealing can result in the structural phase transition, the mismatch of the crystal lattices between MnSb and GaSb, an increase in the average volume of MnSb nanoinclusions, and a change in their stoichiometry.
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FUNDING
This work was supported within the state assignment 007-00160-18-00 using the equipment of the Analytical Center for Collective Use of the Institute of Problems of Chemical Physics, Russian Academy of Sciences, and with the support of the Ministry of Education and Science of the Russian Federation (project no. 16.2814.2017/PCh) and the Russian Foundation for Basic Research (project nos. 17-02-00262 and 15-07-03580). Regarding the deposition of thin GaMnSb films, the work was supported by the Ministry of Science and Higher Education in the framework of the state assignment of the Federal Research Center for Crystallography and Photonics, Russian Academy of Sciences (agreement no. 007-GZ/Ch3363/26).
ACKNOWLEDGMENTS
A.I. Dmitriev is grateful to A.D. Talantsev for his help in research using the SQUID magnetometer.
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Dmitriev, A.I., Kochura, A.V., Kuz’menko, A.P. et al. Effect of Heat Treatment on the Dispersion of the Magnetic Anisotropy of MnSb Nanoinclusions Embedded in Thin GaMnSb Films. Phys. Solid State 61, 523–529 (2019). https://doi.org/10.1134/S1063783419040073
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DOI: https://doi.org/10.1134/S1063783419040073