Anisotropy of hexagonal ferrites with M, W and Y structures containing Fe3+ and Fe2+ as magnetic ions
Anisotropy of hexagonal ferrites with M, W and Y structures containing Fe3+ and Fe2+ as magnetic ions
复制标题
含Fe3、Fe2作为磁性离子的M、W、Y结构六方铁氧体的各向异性
DOI：
10.1016/0022-3697(80)90178-x
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发表时间：
1980
影响因子：
4
通讯作者：
R. P. Stapele
中科院分区：
文献类型：
--
作者：
F. Lotgering;P. Locher;R. P. Stapele
在4K下测量了Zn_2Y单晶和BaFe_（2+）_2W、SrFe_（2+）_2W多晶样品的亚铁磁饱和磁矩和六方各向异性常数K_（1）。Fe 2 W的磁矩与共线自旋耦合和Fe 2+离子的已知占位一致。Zn ~（2+）的磁矩比共线组态的磁矩低9%，讨论了Fe ~（2+）在六方晶系铁氧体中的单轴各向异性，并与Co ~（2+）的单轴各向异性进行了比较。Fe ~（2+）各向异性较强的LaM= LaFe ~（2+）Fe ~（3+）~（11）O ~（19），Fe ~（2+）各向异性较弱。这种差异归因于两种化合物中Fe ~（2+）离子所占据位置的对称性差异。现有理论不能满意地解释LaM中Fe ~（2+）的各向异性和四极分裂。计算了M、W和Y结构的偶极-偶极各向异性，发现与文献值有一定的偏差，计算结果表明，三种结构的平均各向异性为1.3 ~ 2.3 cm− 1/Fe ~（3+）.
The ferrimagnetic saturation moment and hexagonal anisotropy constantK1have been measured at 4K on a Zn2Ysingle crystal and on polycrystalline BaFe2+2Wand SrFe2+2Wsamples. The moment of Fe2Wis in agreement with a collinear spin coupling and with the known site occupation for the Fe2+ions. The moment of Zn2Yis 9% lower than the value for a collinear configuration.The uniaxial anisotropy of Fe2+in hexagonal ferrites is discussed and compared with that of Co2+. No noticeable Fe2+anisotropy is found inFe2Win contrast to LaM= LaFe2+Fe3+11O19, in which the Fe2+anisotropy is strong. The difference is attributed to the symmetry difference of the sites occupied by the Fe2+ions in both compounds. The current theory does not satisfactorily explain the anisotropy and quadrupole splitting of Fe2+in LaM. From this it is concluded that admixing of5Estates and (or) the influence of a dynamical Jahn-Teller effect cannot be neglected.The dipole-dipole anisotropy is computed for theM,WandYstructure and some deviation from the literature data is found. Using these results, a mean anisotropy of 1.3 to 2.3 cm−1per Fe3+ion is found for the three structures.