Easy and hard magnetization curves of Nd_2Co_(14)B compound have been measured with extracting-sample-magnetometer(μ_0H_(max)=6T)at 10～300 K.Magnetic anisotropy constants K_1 and K_2 have been determined by fitting ...Easy and hard magnetization curves of Nd_2Co_(14)B compound have been measured with extracting-sample-magnetometer(μ_0H_(max)=6T)at 10～300 K.Magnetic anisotropy constants K_1 and K_2 have been determined by fitting the hard magnetization curves,in which only K_1 ,K_2 and misalignment angle have been taken as fitting parameters.The values of K_1 and K_2 at 4.2 K were derived by extrapolation. Anisotropy coefficients,x_2~° and x_4~°were derived from the anisotropy constants.The anisotropy constant K_2 increases rapidly with increasing temperature when T<T_(sr)and slowly when T>T_(sr).The temperature depen- dence of the magnetic anisotropy coefficient x_2~° was fitted with the formula.The anisotropy coefficients x_2~° can be well described by the tenth-power law from 4.2 K to T_(sr)and by the sixth-power law from T_(sr_ to 300 K.展开更多
基金This work has been supported by the National Natural Science Foundation of P.R.China(5870025)Magnetism Laboratory of Institute of Physics,Beijing,P.R.China.
文摘Easy and hard magnetization curves of Nd_2Co_(14)B compound have been measured with extracting-sample-magnetometer(μ_0H_(max)=6T)at 10～300 K.Magnetic anisotropy constants K_1 and K_2 have been determined by fitting the hard magnetization curves,in which only K_1 ,K_2 and misalignment angle have been taken as fitting parameters.The values of K_1 and K_2 at 4.2 K were derived by extrapolation. Anisotropy coefficients,x_2~° and x_4~°were derived from the anisotropy constants.The anisotropy constant K_2 increases rapidly with increasing temperature when T<T_(sr)and slowly when T>T_(sr).The temperature depen- dence of the magnetic anisotropy coefficient x_2~° was fitted with the formula.The anisotropy coefficients x_2~° can be well described by the tenth-power law from 4.2 K to T_(sr)and by the sixth-power law from T_(sr_ to 300 K.
