Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 374, Issue -, Pages 711-715Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2014.09.014
Keywords
Permalloy; Neodymium doping; Magnetization; Coercivity
Funding
- Institute for Experimental Physics IV, Ruhr-University Bochum
- NBRP [2010 CB923404]
- NSFC [50871029, 51322206, 11104027]
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The temperature dependence of the magnetic properties of Ni80Fe20 thin films with dilute Nd dopants has been studied. The effect of Nd dopants on the hysteresis loops of Nd-doped Ni80Fe20 thin films is small at room temperature but large at low temperature. The measurements show an interesting temperature dependence of the coercivity with different concentrations of Nd impurities, which might be related to the film structure. The temperature dependence of the saturation magnetization for Nd-doped Ni80Fe20 thin films is fitted by a theoretical expression of spin-wave excitation plus Stoner-type-like contribution, in which the spin-wave excitation plays a main role at low temperature. The spin-wave stiffness constant D evaluated from the fitting shows a strong doping concentration dependence. (C) 2014 Elsevier By. All rights reserved.
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