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Magnetization process in holmium: easy axis spin reorientation induced by the magnetostrictive basal plane distortion
L Benito1, M Ciria, C de la Fuente
1Departamento de Magnetismo de Sólidos-I.C.M.A., Departamento de Física de la Materia Condensada, and Instituto de Nanociencia de Aragón, Universidad de Zaragoza and C.S.I.C., 50071 Zaragoza, Spain.
Abstract:
We report on the change of the easy axis direction in holmium, from the a to the b axis, under the application of a magnetic field in the basal plane. This spin reorientation is observed by measuring the magnetic torque in Ho(n)/Lu(15) superlattices (n and 15 are the number of atomic planes in the Ho and Lu blocks). We also observe that, at the field H0 and temperature at which the reorientation occurs, both axes are easy directions. Based on the fact that the field H0 depends on n in the same way as the field-induced magnetoelastic distortion does, we propose that this spin reorientation originates from the strong field-induced magnetoelastic deformation within the basal plane. The modulation of the alpha strains with sixfold symmetry originates a 12-fold term in the magnetic anisotropy energy.
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