Physics of the Solid State
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Weak ferrimagnets of the YFe1-xCrxO3 type: negative magnetization and spin reorientation
Vasinovich E. V.
1, Moskvin A. S.
1,2
1Ural Federal University after the first President of Russia B.N. Yeltsin, Yekaterinburg, Russia
2M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia
2M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia
Email: evgeny.vasinovich@urfu.ru
In this work, we present an analysis of magnetic properties of weak ferrimagnets of the YFe1-xCrxO3 type. Taking into account the main spin interactions - isotropic Heisenberg superexchange, antisymmetric Dzyaloshinskii-Moriya exchange, single-ion spin anisotropy - calculations of the free energy, concentration and temperature dependences of magnetization were carried out within a framework of a molecular field model. In particular, the model demonstrates the phenomena of temperature compensation and negative magnetization, as well as spin reorientation. The compensation temperature reaches room temperature T=300 K in a composition with x~ 0.45. The existence of magnetic structures of the Gxyz type with the spatial orientation of the Neel vector is predicted. Keywords: weak ferrimagnetism, negative magnetization, spin reorientation, Dzyaloshinskii-Moriya interaction, orthoferrites, orthochromites.
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