Physics of the Solid State
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Simple spin-reorientation model for rare-earth orthoferrites and orthochromites
Vasinovich E. V. 1, Moskvin A. S. 1
1Ural Federal University after the first President of Russia B.N. Yeltsin, Yekaterinburg, Russia
Email: e.vasinovich@gmail.com, alexander.moskvin@urfu.ru

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A simple theory of spontaneous spin reorientation in rare-earth orthoferrites RFeO3 and orthochromites RCrO3 induced by 4f-3d-interaction is presented. It is shown that both the temperature and the nature of the spin reorientation are the result of the competition between the second- and fourth-order spin anisotropy of the 3d-sublattice, the crystal field for 4f-ions, and also the 4f-3d interaction. A case of the substitution of the rare-earth ions with a non-magnetic impurity is also considered. Keywords: spin reorientation, 4f-3d interaction, weak ferromagnetism, orthoferrites, orthochromites.
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Ioffe Institute

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