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Magnetic phase transitions in ferrimagnetic DyFe5Al7 near the compensation point

  • Electrical and Magnetic Properties
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Abstract

The magnetization curves of single-crystal DyFe5Al7 have been measured along the main crystal-lographic directions in the magnetically ordered state. The temperature dependences of the magnetic moments of the Dy and Fe sublattices and the parameter of the intersublattice exchange have been determined in the model of molecular field. Upon the measurements along the easy axis, jumps of magnetization, the values and critical fields of which strongly depend on temperature, have been revealed near the temperature of magnetic compensation. A model of the magnetization of a ferrimagnet with two magnetic sublattices coupled by weak intersublattice exchange has been suggested. Using this model, analytical expressions for the magnetization curve and critical field of the spin-reorientation transition have been obtained. A magnetic phase diagram has been constructed and magnetic structures that are realized in different fields at different temperatures have been determined. The generalization of the model to the case of a noncollinear Fe sublattice has been generalized.

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Authors and Affiliations

  1. Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, ul. S. Kovalevskoi 18, Ekaterinburg, 620990, Russia

    N. V. Mushnikov & E. V. Rozenfel’d

  2. Institute of Physics, Czech Academy of Sciences, Na Slovance 2, Prague, 18221, Czech Republic

    D. I. Gorbunov & A. V. Andreev

  3. Department of Physics of Condensed Matter, Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 5, Prague, 12116, Czech Republic

    D. I. Gorbunov

Authors
  1. N. V. Mushnikov
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  2. E. V. Rozenfel’d
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  3. D. I. Gorbunov
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  4. A. V. Andreev
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Correspondence to N. V. Mushnikov.

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Original Russian Text © N.V. Mushnikov, E.V. Rozenfel’d, D.I. Gorbunov, A.V. Andreev, 2014, published in Fizika Metallov i Metallovedenie, 2014, Vol. 115, No. 3, pp. 274–284.

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Mushnikov, N.V., Rozenfel’d, E.V., Gorbunov, D.I. et al. Magnetic phase transitions in ferrimagnetic DyFe5Al7 near the compensation point. Phys. Metals Metallogr. 115, 257–267 (2014). https://doi.org/10.1134/S0031918X14030077

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  • DOI: https://doi.org/10.1134/S0031918X14030077

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