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Title: Tuning interfacial ferromagnetism in LaNiO 3 / CaMnO 3 superlattices by stabilizing nonequilibrium crystal symmetry

Journal Article · · Physical Review B
 [1];  [1];  [2];  [3];  [3];  [1]
  1. Stanford Univ., Stanford, CA (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. 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
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

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