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Domain Structure and Magnetic Properties of Epitaxial Rare Earth-Transition Metal Thin Films

机译:外延稀土过渡金属薄膜的畴结构和磁性能

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摘要

Rare Earth-Transition Metal permanent magnet films were epitaxially grown by pulsed laser deposition on heated MgO single crystal substrates of different orientations. The epitaxial growth relation of film, buffer and substrate is studied by pole figure measurements and its consequences on the anisotropic magnetic behavior are discussed. In the investigated material systems, RCo5 (R = Sm, Pr) and Nd-Fe-B, high anisotropies and coercivities are achieved, the film morphology, domain structure and the coercivity mechanism are, however, distinctly different. The small scaled domain structure found for SmCo5 and PrCo5 films is a consequence of the small grain sizes and the magnetization process is dominated by strong pinning. Nd2Fe14B based films, on the other hand, are nucleation type magnets and coercivity is influenced by film morphology and roughness.
机译:通过脉冲激光沉积在不同方向的加热的MgO单晶衬底上外延生长稀土过渡金属永磁体膜。通过极图测量研究了薄膜,缓冲层和衬底的外延生长关系,并讨论了其对各向异性磁行为的影响。在所研究的材料体系中,获得了RCo5(R = Sm,Pr)和Nd-Fe-B,具有高的各向异性和矫顽力,但是薄膜的形貌,畴结构和矫顽力机理却明显不同。 SmCo5和PrCo5薄膜的小尺寸畴结构是小晶粒的结果,磁化过程主要由强钉扎控制。另一方面,基于Nd2Fe14B的薄膜是成核型磁体,矫顽力受薄膜形态和粗糙度的影响。

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