Title :
Angular dependence of coercivity for Nd15Fe77B8 in the temperature range from 4.2 to 300 K
Author :
Otani, Yoshichika ; Miyajima, Hideki ; Kubodera, Toshimitsu ; Chikazumi, Soshin
Author_Institution :
Dept. of Pure & Appl. Phys., Trinity Coll., Dublin, Ireland
fDate :
9/1/1990 12:00:00 AM
Abstract :
Defining the fields Bn1 and Bn2 , where the magnetization reversal begins and ends, the simple linear relationship Bn2=aBn1+bμ0 Ms/cos θ was observed, where a and b are coefficients. Furthermore, from the temperature dependence of the change in magnetic energy ΔE in the system, an activation volume was obtained as a function of temperature. The values are in good agreement with the results obtained from magnetic viscosity measurements. This indicates that magnetization reversal is thermally initiated in a small activation volume
Keywords :
boron alloys; coercive force; ferromagnetic properties of substances; iron alloys; magnetisation reversal; neodymium alloys; 4.2 to 300 K; Nd15Fe77B8; activation volume; angular dependence; coercivity; linear relationship; magnetic energy; magnetic viscosity measurements; magnetization reversal; temperature dependence; thermally initiated; Coercive force; Demagnetization; Iron; Magnetic anisotropy; Magnetic field measurement; Magnetization reversal; Neodymium; Perpendicular magnetic anisotropy; Temperature dependence; Temperature distribution;
Journal_Title :
Magnetics, IEEE Transactions on
