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超微粒的磁性明显不同于大晶粒材料,其独特的性质和在众多领域中的应用受到人们的普遍重视。由于尺寸效应,磁有序材料的超微粒不仅具有超顺磁性和集体磁激发现象,其磁转变温度也不同于相同材料的大块样品而受颗粒尺寸的影响。研究超微粒的各种性质及其机制对于理论和
The magnetic properties of ultrafine particles are obviously different from those of the large ones. Their unique properties and their applications in many fields are universally valued. Due to the size effect, the ultrafine particles of the magnetic ordered material not only have superparamagnetic and collective magnetic excitation phenomena, but also have different magnetic transition temperatures from the bulk samples of the same material, depending on the size of the particles. To study the various properties of ultrafine particles and their mechanisms for the theory and