【摘要】 采用磁控溅射法制备了多晶的Co、Co50N i50、N i薄膜,测量了退火前后这些薄膜的磁滞回线,研究了磁滞回线的面积随外加交流磁场的振幅、频率的变化关系.实验结果表明,退火前后Co、Co50N i50和N i磁性薄膜的磁化动力学行为都满足标度关系A=A0+Hα0Ωβ,退火后磁性薄膜的α值增加,β值减少,这主要是退火后磁性膜的磁各向异性减少.更多还原

【Abstract】 Polycrystalline Co,Co₅₀Ni₅₀,Ni films were deposited on Si substrate by magnetron sputtering.The magnetization hysteresis loops of the prepared and annealed Co,Co₅₀Ni₅₀,Ni films have been measured.The hysteresis loop areas as functions of the frequency Ω and amplitude H₀ of applied magnetic field H（t） were studied.The experimental results indicate that,the average hysteresis loop areas A for all prepared and annealed samples appear to display the powerlaw dependency on the frequency ω and amplitude H₀ of H（t）,A=A₀+H^α₀Ω^β,where α and β are the scaling exponents.The annealing lets the value of α increase and the magnitude of β decrease,which is attributed to the decrease of the anisotropy under the annealing.The simulated scaling constants α and β as a function of the anisotropy with Monte Carlo method explain the experimental facts well.更多还原