Indium을 치환 첨가한 Yttrium Iron Garnet의 자기특성

초록

Microwave ferrite devices require polycrystalline single phase materials approaching high performance as thin or thick films in applications. Yttrium iron garnet(YIG) has been well known as microwave materials of low magnetic loss and applied to isolator, circulator, oscillator as devices. In terms of high performance of YIG, those studies such as the magnetic crystallographic anisotropy of ferrimagnetic garnets have been carried out principally on the yttrium and rare-earth garnets. Substituted garnets, compounds in which part of the Fe3+ ions are replaced by other diamagnetic or paramagnetic ions, have been studied. For example, magnetic anisotropy studies of substituted garnets are of great Interest, since the charge of anisotropy upon substitution allows a better understanding of the mechanism of its formation. Generally Indium prefers the octahedral site in the garnet structures and make anisotropic constant K1 decreased with substitution. To investigate the effect of substitution on properties of YIG, we have selected indium as a substituent and temperature dependence of magnetization and hysteresis change with temperature for modified YIG were characterized mainly and their microstructures were also presented.