Nuclear Magnetic Resonance Study of the Easy Axis of Magnetization in Manganese Bismuthide
Nuclear Magnetic Resonance Study of the Easy Axis of Magnetization in Manganese Bismuthide
复制标题
铋化锰易磁化轴的核磁共振研究
DOI：
10.1143/jpsj.29.343
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发表时间：
1970
影响因子：
1.7
通讯作者：
Kōi Yoshitaka
中科院分区：
文献类型：
--
作者：
Hihara Tadamiki;Kōi Yoshitaka
在 4.2°K 至 500°K 的温度范围内观察到铁磁 MnBi 中 Mn 55 的零场核磁共振。在 294°K 下，分别在 225.01 MHz 和 206 MHz 处分别观察到来自畴和畴壁中的原子核的共振信号。随着温度降低，四极分裂和域信号中心线频率分别在低于142°K和略低于142°K的温度下逐渐降低，并在90°K处突然变化。这些结果表明，低于 142°K 时，磁矩逐渐偏离 c 轴，并在 90°K 时转向 c 面。还观察到了NMR强度的温度依赖性，由此获得了各向异性常数K 1 的定性温度变化。外推至 0°K 的超精细场和 e 2 q Q / h 分别为 -224.5 kOe 和 14.0 MHz。
The zero-field NMR of Mn 55 in ferromagnetic MnBi has been observed in the temperature range 4.2°K to 500°K. Resonance signals from nuclei in the domain and domain wall are separately observed at 225.01 MHz, and 206 MHz, respectively, at 294°K. As the temperature is decreased, the quadrupole splitting and the frequency of the central line for the domain signal decrease gradually below 142°K and a temperature somewhat lower than 142°K, respectively, and change abruptly at 90°K. These results show that below 142°K the magnetic moment deviates gradually from the c -axis and flops into the c -plane at 90°K. The temperature dependence of the NMR intensity has also been observed, from which a qualitative temperature variation of the anisotropy constant K 1 has been obtained. The hyperfine field and e 2 q Q / h extrapolated to 0°K are -224.5 kOe and 14.0 MHz, respectively.