Title :
Temperature dependence of the magnetization of nanocrystalline Fe 68.5Co5Nb3CuSi13.5B9 alloy
Author :
Yu, Seong-Cho ; Kim, Kyeong-Sup ; Cho, Yong-Soo ; Kim, Taik-Kee
Author_Institution :
Dept. of Phys., Chung-Buk Nat. Univ., Cheongju, South Korea
fDate :
9/1/1992 12:00:00 AM
Abstract :
The authors report on the effect of annealing temperatures on the spin wave excitations for the nanocrystalline Fe68.5Co5 Nb3CuSi13.5B9 alloy, observed from the low-temperature magnetization curves and the spectroscopic splitting g-factors. The temperature dependence of magnetization was measured with a vibrating sample magnetometer and spectroscopic splitting g-values were estimated from ferromagnetic resonance experiments. Coercive force, initial permeability, and AC power loss of the annealed alloys have been studied systematically. The thermomagnetization curve is found to obey the Bloch law, Ms(T)=Ms(0) (1-BT3/2-CT5/2). From these experimental results, spin wave stiffness constants and the range of the exchange interaction within the annealing condition were calculated. The source of the excellent soft magnetic properties in the alloy with ultrafine grains may be the softening of the spin wave, in addition to the grain size effect
Keywords :
annealing; boron alloys; cobalt alloys; coercive force; copper alloys; ferromagnetic properties of substances; ferromagnetic resonance; g-factor; grain size; iron alloys; magnetic permeability; magnetic properties of amorphous substances; magnetisation; metallic glasses; nanostructured materials; niobium alloys; silicon alloys; spin waves; 600 C; AC power loss; Bloch law; Fe68.5Co5Nb3CuSi13.5B9 alloy; annealing temperatures; coercive force; exchange interaction; ferromagnetic resonance; grain size effect; initial permeability; low-temperature magnetization curves; metallic glass; nanocrystalline; soft magnetic properties; spectroscopic splitting g-values; spin wave stiffness constants; temperature dependence; thermomagnetization curve; Annealing; Cobalt alloys; Iron alloys; Magnetic resonance; Magnetization; Magnetometers; Niobium alloys; Spectroscopy; Temperature dependence; Vibration measurement;
Journal_Title :
Magnetics, IEEE Transactions on
