The specific saturation magnetization(σ_s) of the granular films decreases with the decrease of particle dimension. The peak occurs in the dependence of the coercivity ( H_c) on Fe particles dimension, which displays the critical property of the magnetic single domain particle. 颗粒膜的比饱和磁化强度σs随Fe颗粒尺寸的减小而降低,矫顽力Hc随Fe颗粒尺寸的变化出现峰值,表现出磁性单畴颗粒的临界特性。
The single domain particle has a flat shape and its thickness is far less than the length-width sizes. 单畴纳米磁性颗粒为扁平状薄膜小颗粒,其厚度远远小于长宽尺寸。