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Correlation Between Saturation Magnetostriction and Damping Constant in (\hbox {Ni-Fe})_{1-x}\hbox {M}{x} ( \hbox {M}=\hbox {Pt} , Au, Pd, and Cr) Films

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5 Author(s)
Yasushi Endo ; Dept. of Electr. & Commun. Eng., Tohoku Univ., Sendai, Japan ; Yoshio Mitsuzuka ; Kohei Okawa ; Yutaka Shimada
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This paper describes our experimental investigation on a correlation between saturation magnetostriction and damping constant in 50-nm-thick (Ni-Fe)1-xMx (M=Pt , Au, Pd, and Cr; 0 <; x <; 0.12) films. The change in a with x is closely related with that of λs for every M: when M=Pt , Au, and Pd, a decreases almost monotonically with increasing λs, while it increases in (Ni-Fe)1-xCrx films. These results give clear evidence that a correlates with λs in (Ni-Fe)1-xMx films. These results also reveal that a can be controlled effectively by transition metal dopants. In addition, it should be pointed out that when adjusting a of magnetically soft films, particular attention must be paid to considerable change of magnetoelastic properties that leads to deterioration of magnetic softness.

Published in:

IEEE Transactions on Magnetics  (Volume:47 ,  Issue: 10 )