Magnetic viscosity analysis is a widely studied topic in understanding the stability and magnetization mechanisms of magnets. However, observing the minute changes in magnetic domains during the magnetic viscosity process poses a challenge in research. To address this issue, a self-made in-situ magnetized sample holder was used in this study to observe the dynamic evolution of domain structures in alnico alloy during magnetic viscosity. The findings indicate that the domain reversal during magnetic viscosity is largely irreversible, with only minor reversible changes observed in the inhomogeneous region. The magnetization reversal in alnico alloy occurs through the reversal of α1 phases, which follows a single domain particle reversal mode. The zero-field activation energy () of alnico alloy is determined as 3.30 × 10 J, and the coercivity field without thermal disturbance () is measured at 1779.19 Oe. This research method proves to be a valuable tool in the study of magnetic materials.

中文翻译：

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永磁体磁粘期间磁畴反转的原位观察

磁粘度分析是了解磁体稳定性和磁化机制的一个广泛研究的课题。然而，观察磁粘过程中磁畴的微小变化给研究带来了挑战。为了解决这个问题，本研究使用自制的原位磁化样品架来观察磁粘期间铝镍钴合金中磁畴结构的动态演化。研究结果表明，磁粘性过程中的磁畴反转在很大程度上是不可逆的，在不均匀区域中仅观察到微小的可逆变化。铝镍钴合金中的磁化反转是通过 α1 相的反转发生的，遵循单畴粒子反转模式。确定铝镍钴合金的零场活化能()为3.30×10 J，无热扰动时的矫顽力场()测得为1779.19 Oe。这种研究方法被证明是磁性材料研究中的一个有价值的工具。