纳米晶ErCo2的磁性
Magnetic behavior of nanocrystalline ErCo2
摘要：
我们已经研究了一个众所周知的Laves相化合物，ErCo 2-的散装形式，其中已被称为经历一个有趣的一阶亚铁磁有序近32 K -通过高能球磨合成的纳米晶形式的磁性行为。据发现，在这些纳米晶，钴表现出铁磁秩序在室温下推断的磁化数据。然而，Er亚晶格的磁转变温度基本上不受影响，好像（Er）4f-Co（3d）耦合对Er磁性是弱的。净磁矩，在高场测量，坐在120千奥斯特，显着减少相对于散装在亚铁磁有序状态和可能的原因进行了概述。我们还比较了块状和纳米颗粒的磁热行为。
英文摘要：
We have investigated the magnetic behavior of the nanocrystalline form of a well-known Laves phase compound, ErCo2 - the bulk form of which has been known to undergo an interesting first-order ferrimagnetic ordering near 32 K - synthesized by high-energy ball-milling. It is found that, in these nanocrystallites, Co exhibits ferromagnetic order at room temperature as inferred from the magnetization data. However, the magnetic transition temperature for Er sublattice remains essentially unaffected as though the (Er)4f-Co(3d) coupling is weak on Er magnetism. The net magnetic moment as measured at high fields, sat at 120 kOe, is significantly reduced with respect to that for the bulk in the ferrimagnetically ordered state and possible reasons are outlined. We have also compared the magnetocaloric behavior for the bulk and the nano particles.
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