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High rotatable magnetic anisotropy in MnBi thin films

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Abstract

The variations of the structural and magnetic properties of Bi/Mn/Bi and Mn/Bi/Mn trilayer film systems of equiatomic composition in the process of vacuum annealing are studied. The annealing of Bi/Mn/Bi films at a temperature of 270°C for an hour results in the synthesis of the well-studied highly oriented low-temperature LT-MnBi(001) phase with the perpendicular magnetic anisotropy K u ∼ 1.1 × 107 erg/cm3 and coercivity H C ∼ 1.5 kOe. In contrast to Bi/Mn/Bi, polycrystalline LT-MnBi nanoclusters are formed in Mn/Bi/Mn films under the same annealing conditions. A high rotatable magnetic anisotropy exceeding the shape anisotropy is detected in the films under consideration: the easy axis of anisotropy with the inclusion of the delay angle in magnetic fields above the coercivity H > H C = 9.0 kOe can be oriented in any spatial direction. It is shown that the nature of rotatable magnetic anisotropy is due to the structural coexistence of epitaxially coupled LT-MnBi and QHTP-Mn1.08Bi phases. The reported experimental results indicate the existence of a new class of ferromagnetic film media with the spatially tunable easy axis.

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Authors and Affiliations

  1. Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russia

    V. G. Myagkov, L. E. Bykova, V. Yu. Yakovchuk, A. A. Matsynin, D. A. Velikanov, G. S. Patrin & G. Yu. Yurkin

  2. Siberian Federal University, Krasnoyarsk, 660041, Russia

    G. S. Patrin & G. Yu. Yurkin

  3. Institute of Chemistry and Chemical Technology, Federal Research Center Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660049, Russia

    G. N. Bondarenko

Authors
  1. V. G. Myagkov
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  2. L. E. Bykova
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  3. V. Yu. Yakovchuk
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  4. A. A. Matsynin
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  5. D. A. Velikanov
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  6. G. S. Patrin
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  7. G. Yu. Yurkin
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  8. G. N. Bondarenko
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Correspondence to V. G. Myagkov.

Additional information

Original Russian Text © V.G. Myagkov, L.E. Bykova, V.Yu. Yakovchuk, A.A. Matsynin, D.A. Velikanov, G.S. Patrin, G.Yu. Yurkin, G.N. Bondarenko, 2017, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2017, Vol. 105, No. 10, pp. 610–615.

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Myagkov, V.G., Bykova, L.E., Yakovchuk, V.Y. et al. High rotatable magnetic anisotropy in MnBi thin films. Jetp Lett. 105, 651–656 (2017). https://doi.org/10.1134/S0021364017100095

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