Sputter growth and characterization of metamagnetic B2-ordered FeRh epilayers.
Sputter growth and characterization of metamagnetic B2-ordered FeRh epilayers.
复制标题
DOI：
10.3791/50603
复制
发表时间：
2013-10-05
期刊：
影响因子：
--
通讯作者：
Marrows CH
中科院分区：
文献类型：
--
作者：
Le Graët C;de Vries MA;McLaren M;Brydson RM;Loving M;Heiman D;Lewis LH;Marrows CH
化学有序的合金在各种磁性纳米技术中都很有用。最方便的方法是使用溅射技术在工业规模上制备它们。本文介绍了一种在单晶氧化镁衬底上溅射制备B2有序FeRh外延薄膜的方法。在加热的衬底上以低速沉积允许吸附原子有时间稳定在与衬底具有明确外延关系的晶格中，并在B2结构的Fe和Rh亚晶格中找到合适的位置。该结构可方便地用X射线反射仪和衍射仪进行表征，并可直接用透射电子显微镜截面进行可视化。B2有序的FeRh表现出一种不同寻常的亚磁相变：基态是反铁磁性的，但合金在加热时转变为铁磁体，典型的相变温度约为380K。这伴随着晶胞1%的体积膨胀：体相各向同性，但在外延层中横向夹持。反铁磁性基态的存在及其伴随的一级相变对正确的等原子化学计量比和正确的B2有序非常敏感，因此是展示用这种方法可以沉积的层的质量的一种方便的手段。我们还给出了一些可以检测相位变化的各种技术的例子。
Chemically ordered alloys are useful in a variety of magnetic nanotechnologies. They are most conveniently prepared at an industrial scale using sputtering techniques. Here we describe a method for preparing epitaxial thin films of B2-ordered FeRh by sputter deposition onto single crystal MgO substrates. Deposition at a slow rate onto a heated substrate allows time for the adatoms to both settle into a lattice with a well-defined epitaxial relationship with the substrate and also to find their proper places in the Fe and Rh sublattices of the B2 structure. The structure is conveniently characterized with X-ray reflectometry and diffraction and can be visualised directly using transmission electron micrograph cross-sections. B2-ordered FeRh exhibits an unusual metamagnetic phase transition: the ground state is antiferromagnetic but the alloy transforms into a ferromagnet on heating with a typical transition temperature of about 380 K. This is accompanied by a 1% volume expansion of the unit cell: isotropic in bulk, but laterally clamped in an epilayer. The presence of the antiferromagnetic ground state and the associated first order phase transition is very sensitive to the correct equiatomic stoichiometry and proper B2 ordering, and so is a convenient means to demonstrate the quality of the layers that can be deposited with this approach. We also give some examples of the various techniques by which the change in phase can be detected.
登录
查看更多内容
影响因子：
3.2
作者：
KOUVEL, JS
通讯作者：
KOUVEL, JS
影响因子：
3.7
作者：
Kushwaha, Pallavi;Lakhani, Archana;Chaddah, P.
通讯作者：
Chaddah, P.
影响因子：
2.1
作者：
Lu, Wei;Nam, Nguyen T.;Suzuki, Takao
通讯作者：
Suzuki, Takao
影响因子：
4.4
作者：
MULDAWER, L;DEBERGEVIN, F
通讯作者：
DEBERGEVIN, F
影响因子：
3.7
作者：
Saerbeck, T.;Klose, F.;Schreyer, A.
通讯作者：
Schreyer, A.