Tuning interfacial ferromagnetism in superlattices by stabilizing nonequilibrium crystal symmetry
- Stanford Univ., Stanford, CA (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
Perovskite oxide heterostructures offer an important path forward for stabilizing and controlling low-dimensional magnetism. One of the guiding design principles for these materials systems is octahedral connectivity. In superlattices composed of perovskites with different crystal symmetries, variation of the relative ratio of the constituent layers and the individual layer thicknesses gives rise to nonequilibrium crystal symmetries that, in turn, lead to unprecedented control of interfacial ferromagnetism. We have found that in superlattices of CaMnO3 (CMO) and LaNiO3 (LNO), interfacial ferromagnetism can be modulated by a factor of 3 depending on LNO and CMO layer thicknesses as well as their relative ratio. Such an effect is only possible due to the nonequilibrium crystal symmetries at the interfaces and can be understood in terms of the anisotropy of the exchange interactions and modifications in the interfacial Ni-O-Mn and Mn-O-Mn bond angles and lengths with increasing LNO layer thickness. These results demonstrate the potential of engineering nonequilibrium crystal symmetries in designing ferromagnetism.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0008505; AC02-05CH11231; AC02-76SF00515; AC02-06CH11357
- OSTI ID:
- 1406491
- Alternate ID(s):
- OSTI ID: 1406147; OSTI ID: 1461516
- Journal Information:
- Physical Review B, Vol. 96, Issue 14; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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