This letter discusses the temperature dependence of the magnetic field at which irreversible magnetic flux loss of ferrite sintered magnets is initiated. In this material class such a field might reduce linearly: comparable behavior to that observed for Nd-Fe-B-based sintered counterparts increases linearly or even peaks for temperatures above 350 K. These differences are attributed to variations in the saturation polarization and magnetocrystalline anisotropy constant(s) of the hard-magnetic phase arising from changes in the chemical composition. A comparison between HK and HD5, where the latter is defined in an IEC standard, is also presented and discussed.

中文翻译：

---

烧结铁氧体磁体不可逆磁通损耗场的温度依赖性：与化学成分和物理特性的联系

这封信讨论了引发铁氧体烧结磁铁不可逆磁通损耗的磁场的温度依赖性。在这种材料类别中，这样的场可能会线性降低：与 Nd-Fe-B 基烧结对应物所观察到的相当的行为线性增加甚至在 350 K 以上的温度达到峰值。 这些差异归因于饱和极化和磁晶各向异性的变化由化学成分变化引起的硬磁相常数。还介绍和讨论了 HK 和 HD5（后者在 IEC 标准中定义）之间的比较。