Evolution of the ferromagnetic phase of ultrathin Fe films grown on GaAs(100)-4x6
Evolution of the ferromagnetic phase of ultrathin Fe films grown on GaAs(100)-4x6
复制标题
DOI：
10.1103/physrevb.58.890
复制
发表时间：
1998-07-01
影响因子：
3.7
通讯作者：
Bland, JAC
中科院分区：
文献类型：
--
作者：
Xu, YB;Kernohan, ETM;Bland, JAC
室温下在GaAs（100）-（4 × 6）衬底上生长了bce Fe外延层，用原位磁光克尔效应（MOKE）、低能电子衍射和交变梯度场磁强计（AGFM）研究了bce Fe外延层的磁光特性。在室温下的磁性被发现通过三个阶段进行;一个连续相的前三个半单层，一个短程有序的超顺磁性相，和一个铁磁相以上约五个单层。的厚度依赖性的矫顽力和MOKE强度进一步表明，铁磁相被细分为三个不同的制度，具有不同的磁性。的组合的原位MOKE和非原位AGFM测量表明，整个Fe膜是铁磁性的铁磁性的发病后，与以前的研究，其中磁死层或半磁化相，由于Fe和As的相互混合提出了一个bulklike的时刻。结果表明，it.is该系统中，在决定磁性能方面起主导作用的是As膜的生长形态，而不是As的扩散。[S0163-1829（98）04127-7]。
Epitaxial bce Fe has been grown on GaAs(100)-(4X6) at-room temperature and studied with in situ magneto-optical Kerr effect (MOKE), low-energy electron diffraction, and alternating gradient field magnetometry (AGFM). The magnetic properties at room temperature were found to proceed via three phases; a nonmagnetic phase for the first three and a half monolayers, a short-range-ordered superparamagnetic phase, and a ferromagnetic phase above about five monolayers. The thickness dependencies of the coercivity and MOKE intensity further suggested that the ferromagnetic phase is subdivided into three distinct regimes with different magnetic properties. A combination of the ill situ MOKE and ex situ AGFM measurements shows that the entire Fe film is ferromagnetic with a bulklike moment after the onset of the ferromagnetism, in contrast with previous studies, in which magnetic dead layers or half-magnetization phases due to the intermixing of Fe and As were proposed. The results show that it.is the growth morphology of the ultrathin films, rather than the diffusion of As, that plays the dominant role in determining the magnetic properties in this system. [S0163-1829(98)04127-7].