Strain-Driven Bidirectional Spin Orientation Control in Epitaxial High Entropy Oxide Films
Zhao, Zhibo (Karlsruhe Institute of Technology. Institute of Nanotechnology)
Jaiswal, Arun Kumar (Karlsruhe Institute of Technology. Institute for Quantum Materials and Technologies)
Wang, Di (Karlsruhe Institute of Technology. Karlsruhe Nano Micro Facility)
Wollersen, Vanessa (Karlsruhe Institute of Technology. Karlsruhe Nano Micro Facility)
Xiao, Zhengyu (Shanxi Normal University. School of Chemistry and Materials Science)
Pradhan, Gajanan (Istituto Nazionale di Ricerca Metrologica)
Celegato, Federica (Istituto Nazionale di Ricerca Metrologica)
Tiberto, Paola (Istituto Nazionale di Ricerca Metrologica)
Szymczak, Maria (AGH University of Science and Technology)
Dabrowa, Juliusz (AGH University of Science and Technology)
Waqar, Moaz (University of California. Department of Materials Science and Engineering)
Fuchs, Dirk (Karlsruhe Institute of Technology. Institute for Quantum Materials and Technologies)
Pan, Xiaoqing (University of California. Department of Physics and Astronomy)
Hahn, Horst (The University of Oklahoma)
Kruk, Robert (Karlsruhe Institute of Technology. Institute of Nanotechnology)
Sarkar, Abhishek (University of California. Department of Materials Science and Engineering)

Data:	2023
Resum:	High entropy oxides (HEOs), based on the incorporation of multiple-principal cations into the crystal lattice, offer the possibility to explore previously inaccessible oxide compositions and unconventional properties. Here it is demonstrated that despite the chemical complexity of HEOs external stimuli, such as epitaxial strain, can selectively stabilize certain magneto-electronic states. Epitaxial (CoCrFeMnNi)O-HEO thin films are grown in three different strain states: tensile, compressive, and relaxed. A unique coexistence of rocksalt and spinel-HEO phases, which are fully coherent with no detectable chemical segregation, is revealed by transmission electron microscopy. This dual-phase coexistence appears as a universal phenomenon in (CoCrFeMnNi)O epitaxial films. Prominent changes in the magnetic anisotropy and domain structure highlight the strain-induced bidirectional control of magnetic properties in HEOs. When the films are relaxed, their magnetization behavior is isotropic, similar to that of bulk materials. However, under tensile strain, the hardness of the out-of-plane (OOP) axis increases significantly. On the other hand, compressive straining results in an easy OOP magnetization and a maze-like magnetic domain structure, indicating the perpendicular magnetic anisotropy. Generally, this study emphasizes the adaptability of the high entropy design strategy, which, when combined with coherent strain engineering, opens additional prospects for fine-tuning properties in oxides.
Ajuts:	European Commission 861145 European Commission 847471
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Publicat a:	Advanced science, Vol. 10, Issue 27 (September 2023) , art. 2304038, ISSN 2198-3844

DOI: 10.1002/advs.202304038
PMID: 37507832

10 p, 3.1 MB

El registre apareix a les col·leccions:
Articles > Articles de recerca
Articles > Articles publicats