Sun Xue Yin, Zhang Chen, Aimon Nicolas M, Goto Taichi, Onbasli Mehmet, Kim Dong Hun, Choi Hong Kyoon, Ross C A
Department of Materials Science and Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.
ACS Comb Sci. 2014 Nov 10;16(11):640-6. doi: 10.1021/co5000773. Epub 2014 Oct 21.
Ferromagnetic Sr(GaxTiyFe0.34-0.40)O3-δ (0.1 ≤ x, y ≤ 0.5) films with single-crystal perovskite structure were epitaxially grown on (001) (LaAlO3)0.3(Sr2AlTaO6)0.7 substrates by combinatorial pulsed laser deposition (CPLD) and compared with previous results from films grown from single targets. In CPLD films the Fe was present as both Fe(2+) and Fe(3+). The distribution of Sr, Ga, Ti, and O was homogeneous, but Fe-rich nanowires with diameter of 3 nm were present perpendicular to the film plane. The unit cell was tetragonally distorted with the ratio of out-of-plane to in-plane lattice parameter decreasing from 1.06 to 1.02 as the Ga content increased. The magnetic easy axis of the films changed from out-of-plane when Ti content y > 0.3 to isotropic as the Ga content increased, consistent with a reduction in magnetoelastic anisotropy. The Ga lowered the Faraday rotation and the magnetization but increased the optical transmittance.
具有单晶钙钛矿结构的铁磁体Sr(GaxTiyFe0.34 - 0.40)O3 - δ（0.1 ≤ x, y ≤ 0.5）薄膜通过组合脉冲激光沉积（CPLD）法在(001)(LaAlO3)0.3(Sr2AlTaO6)0.7衬底上外延生长，并与先前从单靶材生长的薄膜结果进行比较。在CPLD薄膜中，Fe以Fe(2+)和Fe(3+)两种形式存在。Sr、Ga、Ti和O的分布是均匀的，但存在垂直于薄膜平面的直径为3 nm的富Fe纳米线。随着Ga含量的增加，单胞发生四方畸变，面外和面内晶格参数之比从1.06降至1.02。当Ti含量y > 0.3时，薄膜的磁易轴从面外变为随着Ga含量增加而各向同性，这与磁弹性各向异性的降低一致。Ga降低了法拉第旋转和磁化强度，但提高了光学透过率。
