Size-dependent spin-reorientation transition in Nd2Fe14B nanoparticles

作者：Rong Chuan bing^*; Poudyal Narayan; Liu J Ping

来源：Physics Letters, Section A: General, Atomic and Solid State Physics , 2010, 374(38): 3967-3970.

DOI：10.1016/j.physleta.2010.07.061

• Magnetic nanoparticles
• Spin reorientation
• Size effect

It is well known that some ferromagnetic properties like Curie temperature are size dependent. In this Letter we will report that the spin-reorientation temperature of Nd2Fe14B material is also size dependent. By using a surfactant-assisted ball milling technique, Nd2Fe14B nanoparticles with different size about 6, 20 and 300 nm were successfully obtained. Spin-reorientation transition temperature of the NdFeB nanoparticles was then determined by measuring the temperature dependence of DC and AC magnetic susceptibility. It was revealed that the spin-reorientation transition temperature (T-sr) of the nanoparticles is strongly size dependent. T-sr of the 300 nm particles is lower than that of the bulk raw material while the T-sr of the 20 nm particles is significantly lower than that for the 300 nm particles. The physics behind this size dependence is discussed.

• 出版日期2010-8-23