论文标题
interface驱动的磁动率在放松la $ _ {0.7} $ sr $ _ {0.3} $ cro $ _3 $ _3 $/la $ _ $ _ {0.7} $ sr $ _ {0.3}
Interface-driven magnetic anisotropy in relaxed La$_{0.7}$Sr$_{0.3}$CrO$_3$/La$_{0.7}$Sr$_{0.3}$MnO$_3$ heterostructures on MgO
论文作者
论文摘要
我们研究了la $ _ {0.7} $ sr $ _ {0.3} $ CRO $ $ _3 $（lsco）/la $ _ {0.7} $ _ {0.7} $ sr $ _ {0.3} $ MNO $ _3 $ _3 $（LSMO）杂音射击（001）-ORECERIND MORCORING-ORED。由于较大的薄膜基层晶格不匹配，发现应变弛豫发生在膜的前2-3个单位细胞（UC）中，这可以通过反射高能电子衍射和高分辨率同步子X射线互惠空间映射证明。我们发现，LSCO垫片和封盖层的存在导致超薄的LSMO层中的铁磁层，其厚度为2 UC的厚度为2 uc，并在膜平面上取向磁性易于轴。通过鱿鱼磁力测定法，分别测量了[2 UC LSCO/ 2 UC LSMO]和[2 UC LSCO/ 4 UC LSMO]超级晶格的净磁矩为1.4和2.4 $μ_b$/ mn。发现弛豫的[2 UC LSCO/ 4 UC LSMO]异质结构的有效磁各向异性比大量LSMO高出一个数量级，强调了界面磁交换在复杂氧化物接口处调谐磁动体中的界面磁交换相互作用的关键作用。
We investigate the structural and magnetic properties of La$_{0.7}$Sr$_{0.3}$CrO$_3$ (LSCO)/La$_{0.7}$Sr$_{0.3}$MnO$_3$(LSMO) heterostructures grown on (001)-oriented MgO by molecular beam epitaxy. Due to the large film-substrate lattice mismatch, strain relaxation is found to occur within the first 2-3 unit cells (uc) of the film as evidenced by reflection high energy electron diffraction and high-resolution synchrotron X-ray reciprocal space mapping. We find that the presence of the LSCO spacer and capping layers leads to ferromagnetism in ultra-thin LSMO layers with thicknesses on the order of 2 uc with the magnetic easy axis oriented in the film plane. Net magnetic moments of 1.4 and 2.4 $μ_B$/Mn are measured for [2 uc LSCO/ 2 uc LSMO] and [2 uc LSCO/ 4 uc LSMO] superlattices, respectively by SQUID magnetometry. The effective magnetic anisotropy of the relaxed [2 uc LSCO/ 4 uc LSMO] heterostructure is found to be an order of magnitude higher than bulk LSMO highlighting the critical role of interfacial magnetic exchange interactions in tuning magnetic anisotropy at complex oxide interfaces.
