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首页> 外文期刊>Journal of Experimental and Theoretical Physics >Mesoscopic mixing of spin orientation phases in particles with ising ions: Holmium : Yttrium iron garnets in strong magnetic fields
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Mesoscopic mixing of spin orientation phases in particles with ising ions: Holmium : Yttrium iron garnets in strong magnetic fields

机译：粒子中具有自发离子的自旋取向相的介观混合：:：强磁场中的钇铁石榴石

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The paper presents a theoretical analysis of macroscopic quantum tunneling phenomena in small particles of a cubic ferromagnet of the HoxY3 - xFe5O12 type with strongly anisotropic (Ising) impurity ions present in a low concentration x much less than1 in the region of strong magnetic fields, at which many orientation phase transitions related to the competition of external and exchange field actions on the spin subsystem are observed. The theory of path integrals for the magnetic subsystem was used to calculate the instanton contributions to interphase tunneling amplitudes in the vicinity of first-order transitions for three principal orientations of an external magnetic field in a cubic crystal. It was shown that low-energy barriers separating angular phases could result in anomalously large mesoscopic volumes at which macroscopic spin tunneling effects could appear in the energy spectra of particles. The special features of spectral splitting caused by the mixing of azimuthally degenerate angular phases and phases with different polar angles of magnetization orientation were revealed. (C) 2004 MAIK "Nauka / Interperiodica".
机译：本文对HoxY3-xFe5O12型立方铁磁体的小颗粒中的宏观量子隧穿现象进行了理论分析，该杂质在强磁场区域中以低浓度x远小于1的低各向异性（Ising）杂质离子存在。其中观察到许多与自旋子系统上外部和交换场作用的竞争有关的取向相变。磁子系统的路径积分理论用于计算瞬态对立方晶体中外部磁场的三个主要方向的一阶跃迁附近的相间隧穿幅度的贡献。结果表明，分离角相的低能势垒会导致异常大的介观体积，在该体积处宏观自旋隧穿效应会出现在粒子的能谱中。揭示了由方位退化的角相和具有不同磁化取向极角的相混合引起的光谱分裂的特殊特征。 （C）2004 MAIK“ Nauka / Interperiodica”。

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