期刊
ADVANCED SCIENCE
卷 9, 期 10, 页码 -出版社
WILEY
DOI: 10.1002/advs.202200391
关键词
disorder; exchange bias; frustration; high entropy oxides; magnetism
资金
- US Department of Energy (DOE), Office of Basic Energy Sciences (BES), Materials Sciences and Engineering Division
- Center for Materials Processing, a Center of Excellence at the University of Tennessee, Knoxville - Tennessee Higher Education Commission (THEC)
- DOE Office of Science [DE-AC02-06CH11357]
- Oak Ridge National Laboratory (ORNL) by the Scientific User Facilities Division, BES, DOE
High entropy oxides provide a new approach to designing materials with tunable magnetic behaviors by exploiting strong local compositional disorder, leading to a transition from macroscopic order to frustration-driven dynamic spin interactions in magnetic systems.
In magnetic systems, spin and exchange disorder can provide access to quantum criticality, frustration, and spin dynamics, but broad tunability of these responses and a deeper understanding of strong limit disorder are lacking. Here, it is demonstrated that high entropy oxides present a previously unexplored route to designing materials in which the presence of strong local compositional disorder may be exploited to generate tunable magnetic behaviors-from macroscopically ordered states to frustration-driven dynamic spin interactions. Single-crystal La(Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O-3 films are used as a model system hosting a magnetic sublattice with a high degree of microstate disorder in the form of site-to-site spin and exchange type inhomogeneity. A classical Heisenberg model simplified to represent the highest probability microstates well describes how compositionally disordered systems can paradoxically host magnetic uniformity and demonstrates a path toward continuous control over ordering types and critical temperatures. Model-predicted materials are synthesized and found to possess an incipient quantum critical point when magnetic ordering types are designed to be in direct competition, this leads to highly controllable exchange bias behaviors previously accessible only in intentionally designed bilayer heterojunctions.
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