HIGH-FIELD ANTIFERROMAGNETIC RESONANCE IN ALPHA-FE2O3
HIGH-FIELD ANTIFERROMAGNETIC RESONANCE IN ALPHA-FE2O3
复制标题
DOI：
10.1002/pssb.2220560117
复制
发表时间：
1973-01-01
期刊：
影响因子：
--
通讯作者：
TROUP, GJ
中科院分区：
文献类型：
--
作者：
MORRISON, BR;MORRISH, AH;TROUP, GJ
用毫米波和脉冲磁场研究了a-Fe_2O_3的核磁共振。在场和温度感生相界上方，观察到了两个弱铁磁共振模式的耦合。推导了考虑二次各向异性、基面各向异性和磁致伸缩的耦合方程。在相边界以下，研究了反铁磁共振模，导出了基面内场的共振方程。用常规的共振光谱仪观测相边界的结果令人满意地解释为磁化率的巨大变化，数值分析表明，磁化率经常发生在这一边界或其附近。在强磁场下，唯象理论和实验之间存在着微小的定量差异。
Millimetre microwaves and pulsed magnetic fields have been used to investigate the magnetic resonances in a‐Fe2O3. Above the field and temperature induced phase boundary the coupling of the two weak‐ferromagnetic resonance modes has been observed. The coupling equation has been derived taking into account second anisotropy, basal plane anisotropy and magnetostriction. Below the phase boundary the antiferromagnetic resonance modes have been investigated and the resonance equations derived for the field in the basal plane. The observation of the phase boundary using a conventional resonance spectrometer has been satisfactorily interpreted in terms of the large changes in susceptibility which a numerical analysis shows often occur at or near this boundary. A small quantitative difference has been shown to exist between phenomenological theory and experiment at high magnetic fields.