Title :
Estimation of the exchange and crystalline field parameters at R sites in R2Fe14B compounds (R=Pr, Nd, Sm, Tb, Dy, Ho, Er and Tm)
Author :
Yóng, Zhu ; Tiesong, Zhao ; Hanmin, Jin ; Fuming, Yang ; Jinqiang, Xie ; Li Xinnen ; Ruwen, Zhao ; de Boer, F.R.
Author_Institution :
Dept. of Phys., Jilin Univ., Changchun, China
Abstract :
The values of Fe-R exchange-field and crystalline-field parameters averaged over the f and g sites in R2Fe14B (R=Pr, Nd, Sm, Tb, Dy, Ho, Er, and Tm) are evaluated by calculations based on a series of experiments. The experimental data considered are the magnetization curves and the temperature dependence of the angle made by the magnetic easy axis with the c-axis. For the heavy compounds, the temperature dependence of the magnetic moment is also included. The spin-phase diagrams of (R1-xR´x)2Fe14B [(R, R´)=(Pr, Ho), (Nd, Ho)] systems are constructed experimentally. The phase diagrams of (R, R´)=(Pr, Ho), (Nd, Pr), (Nd, Y), (Nd, Ho), (Er, Y), and (Er, Gd) systems, calculated by using the empirically fitted parameters, reproduce the experimental results well
Keywords :
boron alloys; crystal field interactions; dysprosium alloys; erbium alloys; exchange interactions (electron); ferromagnetic properties of substances; holmium alloys; iron alloys; magnetic transitions; magnetisation; neodymium alloys; praseodymium alloys; samarium alloys; terbium alloys; thulium alloys; Dy2Fe14B; Er2Fe14B; Ho2Fe14B; Nd2Fe14B; Pr2Fe14B; Sm2Fe14B; Tb2Fe14B; Tm2Fe14B; crystalline-field parameters; empirically fitted parameters; exchange field parameters; magnetic moment; magnetization curves; spin-phase diagrams; temperature dependence; Crystallization; Eigenvalues and eigenfunctions; Electrons; Iron; Land surface temperature; Least squares methods; Magnetization; Neodymium; Solid state circuits; Tensile stress;
