Fourmont Paul, Cho Eunsoo, Cloutier Sylvain G, Ross Caroline A
École de Technologie Supérieure, Department of Electrical Engineering, 1100 Notre Dame Street West, Montreal, Quebec, H3C 1K3, Canada.
Massachusetts Institute of Technology, Department of Materials Science and Engineering, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA.
Small. 2025 May;21(21):e2501644. doi: 10.1002/smll.202501644. Epub 2025 Apr 13.
Exchange bias (EB), manifested as a hysteresis-loop offset after field-cooling, is demonstrated in perovskite-structured ferromagnet/antiferromagnet (LaSrMnO/YFeO) heterostructures grown on (100) SrTiO substrates. Bilayer samples show an EB of 306 Oe at 50 K, whereas multilayers with five layers exhibit an exchange bias of up to 424 Oe at 50 K. A spin valve consisting of LaSrMnO/SrTiO/LaSrMnO/YFeO shows stable remanent configurations resulting from pinning of the upper LaSrMnO layer by the YFeO. In contrast, EB is not observed on (111)-oriented SrTiO substrates due to interface roughening. These results demonstrate YFeO as an alternative orthoferrite antiferromagnet compared to BiFeO and LaFeO for incorporation into exchange-biased heterostructures.
交换偏置（EB），表现为场冷后的磁滞回线偏移，在生长于（100）SrTiO衬底上的钙钛矿结构铁磁体/反铁磁体（LaSrMnO/YFeO）异质结构中得到证实。双层样品在50 K时显示出306 Oe的交换偏置，而五层的多层结构在50 K时表现出高达424 Oe的交换偏置。由LaSrMnO/SrTiO/LaSrMnO/YFeO组成的自旋阀由于YFeO对上层LaSrMnO层的钉扎作用而显示出稳定的剩余构型。相比之下，由于界面粗糙，在（111）取向的SrTiO衬底上未观察到交换偏置。这些结果表明，与BiFeO和LaFeO相比，YFeO是一种可用于制备交换偏置异质结构的替代正铁氧体反铁磁体。
