Magnetic properties of ordered Pt-Co
Magnetic properties of ordered Pt-Co
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有序 Pt-Co 的磁性
DOI：
10.1109/tmag.1966.1065882
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发表时间：
1966
影响因子：
2.1
通讯作者：
H. Bartholin
中科院分区：
文献类型：
--
作者：
P. Brissonneau;A. Blanchard;H. Bartholin
原子百分含量为50%的铂钴合金可以有序形成CuAu型的四方结构。有序单晶由四方晶系组成，其c轴平行于无序基质的三个长方轴Ox、Oy和Oz。我们的研究是在室温下对有序大晶体进行的，其中三种类型的晶体所占的相对体积是不相等的。磁化强度总是离饱和很远，即使在3.104Oe的外加磁场下也是如此，这表明在每个四方相中都存在很大的各向异性能量。我们测量了在不同磁场下沿三轴原来四倍的磁化强度、三轴原来两倍的磁化强度、一轴原来三倍的磁化强度以及扭矩曲线。所有的测量结果都符合J_{S}=790emu/cm~3和K=5.0\cot10^{7}ergs/cm~3。这种非常大的各向异性能是我们在室温下已知的铁磁体的最大各向异性能，我们认为这是以前发表的关于这种材料的磁性数据之间不一致的原因。
The alloy Pt-Co 50 atomic percent may be ordered into a tetragonal structure of the CuAu type. An ordered single crystal consists of a system of tetragonal crystallites, whose c axes are oriented parallel to the three rectangular axes Ox, Oy, and Oz of the disordered matrix. Our study has been performed at room temperature on an ordered macrocrystal where the relative volumes occupied by the three types of crystallites are unequal. The magnetization is always very far from saturation, even in an applied field of 3.104Oe, demonstrating the existence of a very large anisotropy energy in each of the tetragonal phases. We have measured the magnetization along the three axes originally fourfold, the three axes originally twofold, one axis originally threefold, and torque curves, in different magnetic fields. All measurements are in agreement with J_{s} = 790 emu/cm3and K = 5.0 \cdot 10^{7} ergs/cm3. Such very large anisotropy energy is the largest one known to us at room temperature for a ferromagnet, and we think that it is responsible for the disagreement between magnetic data previously published on this material.