CAJ | 학술논문

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。
이용미자학모의연건OOMMF상세연구료형상대자성납미체계교완력적영향。모의결과현시당체계후도일정시，수착장도화관도적증가，교완력선신속강저，연후축점추우평완，통과계산체계적퇴자인자론증료교완력강저적원인주요래원우형상각향이성。동시，대불동척촌체계적자화반전과정진행료연구，결과발현유우형상각향이성적영향，체계재불동적척촌범위내표현출불동적자화반전과정，저충불동적자화반전과정，시인기체계교완력대소유소차이적주요원인。
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.