Abstract
Thin multilayer films of alternating ultrathin Ni and Tb layers (t(Ni) = 5...80 Angstrom, t(Th) = 30 Angstrom) were sputter-deposited at room temperature and magnetically characterised by temperature-dependent SQUID measurements and torque measurements at T = 300 K. Despite of the multilayer structure of all samples and a transition of the microstructure of the Ni layers the measured spontaneous ...
Abstract
Thin multilayer films of alternating ultrathin Ni and Tb layers (t(Ni) = 5...80 Angstrom, t(Th) = 30 Angstrom) were sputter-deposited at room temperature and magnetically characterised by temperature-dependent SQUID measurements and torque measurements at T = 300 K. Despite of the multilayer structure of all samples and a transition of the microstructure of the Ni layers the measured spontaneous magnetic moment of all samples is explained by a band filling model in analogy to amorphous and crystalline NiRE alloys. The magnetic Ni moment is quenched by a successive filling of its 3d minority band by the 5d, 6s conduction electrons of Tb. As long as the Ni moment is not zero an antiferromagnetic Ni-Tb coupling and a perpendicular anisotropy component appears. The corresponding results of structural investigations are given elsewhere J. Magn. Magn. Mater. 248 (2002) 181. (C) 2002 Elsevier Science B.V. All rights reserved.
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