Shell-ferromagnetism of nano-Heuslers generated by segregation under magnetic field.
Shell-ferromagnetism of nano-Heuslers generated by segregation under magnetic field.
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DOI：
10.1038/srep28931
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发表时间：
2016-07-14
影响因子：
4.6
通讯作者：
Farle M
中科院分区：
文献类型：
--
作者：
Çakır A;Acet M;Farle M
本文报道了AF马氏体Heusler Ni50Mn45In5的一种新的功能性质，当在磁场下高温热处理时，它偏析并形成嵌入在Ni50Mn50基体中的Ni50Mn25In25 Heusler析出物。析出物是顺磁性的，而基质是反铁磁性的。然而，Ni50Mn50与基体界面处的自旋在形核和生长过程中与磁场对准，并在退火过程中沿外加磁场的方向发生强烈钉扎，而核心自旋则变得顺磁。这种壳层铁磁性可持续到600 K，并被如此强烈的钉扎，以至于剩余磁化强度保持不变，即使在磁场反转或当温度在低温和接近退火温度之间循环时也是如此。
We report on a new functional property in an AF martensitic Heusler Ni50Mn45In5, which when annealed at high temperatures under a magnetic field, segregates and forms Ni50Mn25In25 Heusler precipitates embedded in a Ni50Mn50 matrix. The precipitates are paramagnetic whereas the matrix is antiferromagnetic. However, the spins at the interface with the Ni50Mn50 matrix align with the field during their nucleation and growth and become strongly pinned in the direction of the applied field during annealing, whereas the core spins become paramagnetic. This shell-ferromagnetism persists up to 600 K and is so strongly pinned that the remanent magnetization remains unchanged, even when the field is reversed or when the temperature is cycled between low temperatures and close to the annealing temperature.