Magnetic Anisotropy and Magnetostriction of Atom Pairs |
| K. Kułakowski Department of Solid State Physics, Academy of Mining and Metallurgy, Al. Mickiewicza 30, 30-059 Kraków, Poland A.Z. Maksymowicz Department of Theoretical and Computational Physics, Academy of Mining and Metallurgy, Al. Mickiewicza 30, 30-059 Kraków, Poland and M. Magdoń Institute of Physics and Computer Science, Pedagogical University, Podchorążych 2, 30-084 Kraków, Poland |
| Received: October 1, 1993 |
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| We calculated one-electron hopping contribution to two-ion magnetic anisotropy and shape magnetostriction in amorphous 3d-alloys. Calculations were performed in the narrow band limit and include spin-orbit coupling, the Zeeman orbital and spin magnetic moments terms with possible partial effective quenching of the orbital magnetic moments in metals. The parameters for numerical calculations are expected to correspond to pairs of Fe atoms with the spin-orbit coupling A= 0.03 eV and hopping integrals of about 3 eV. The magnetic anisotropy K changes its sign at some value ΔK of effective magnetic splitting Δ proportional to the magnetization. Then the local easy axis which is parallel to the direction of the pair for small Δ switches to perpendicular easy plane case. K is nearly linear vs. Δ for small Δ and varies roughly as Δ3 for large splitting. The dependence of magnetostriction B on Δ is similar to that of magnetic anisotropy K(Δ). For small values of Δ the coefficient B is also linear. Magnetostriction changes its sign at ΔB and becomes positive for Δ greater than ΔK. |
| DOI: 10.12693/APhysPolA.85.869 PACS numbers: 75.80.+q |