Magnetocrystalline anisotropy and inversion degree of manganese-ferrous-ferrites |
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| Authors: | B. Hoekstra V.A.M. Brabers |
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| Affiliation: | Phillips Research Laboratories, Eindhoven, The Netherlands;Eindhoven University of Technology, Eindhoven, The Netherlands |
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| Abstract: | Torque measurements have been performed at 4 and 77 K on single crystals of Mn1?xFe2+xO4 (0<x<0.05) and MnFe2?xTixO4 (0<x<0.1). The crystals were either quenched or slowly cooled causing a change of inversion by 0.1. It is found that the magnetic anisotropy due to the ferrous ions in the Ti-doped samples is 80 per cent larger than in the Mn1?xFe2+xO4 crystals. In both crystal series the ferrous ion anisotropy in the slowly cooled crystals is 70 per cent higher than in the quenched crystals. The K1 of MnFe2O4 at 4 K is found to decrease from ?3.6 × 105 erg/cm3 after show cooling, down to ?2.6 × 105 erg/cm3 after quenching. |
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