磁性纳米体系形状各向异性效应的微磁学模拟  

Micromagnetic simulation on shape anisotropy effect of the magnetic nano-system

作　　者：张军[1] 王炎[1] 薛金辉[1] 王中慧[1] 邓晨华[1] 

机构地区：[1]吕梁学院化学与化工系,山西吕梁033000

出　　处：《磁性材料及器件》2013年第6期13-16,共4页Journal of Magnetic Materials and Devices

摘　　要：利用微磁学模拟软件OOMMF详细研究了形状对磁性纳米体系矫顽力的影响。模拟结果显示当体系厚度一定时,随着长度和宽度的增加,矫顽力先迅速降低,然后逐渐趋于平缓,通过计算体系的退磁因子论证了矫顽力降低的原因主要来源于形状各向异性。同时,对不同尺寸体系的磁化反转过程进行了研究,结果发现由于形状各向异性的影响,体系在不同的尺寸范围内表现出不同的磁化反转过程,这种不同的磁化反转过程,是引起体系矫顽力大小有所差异的主要原因。Using the micromagnetic simulation software OOMMF, we have investigated the influence of shape on coercivity of magnetic nanometer system in detail. The result shows that the coercivity has a sharp reduction and then tends to be constant with increasing lateral dimensions of system, and the coercivity reduction comes from the shape anisotropy by calculating systemic demagnetization factor. Moreover, study on magnetization reversal process of different system indicates that the system exhibit different magnetization reversal processes in different size ranges due to the effect of shape anisotropy, and differences in coercivities can be attributed to the different magnetization reversal process.

关 键 词：磁性纳米体系 矫顽力 形状各向异性 微磁学模拟 

分 类 号：TB383[一般工业技术—材料科学与工程] O482.5[理学—固体物理]