Exchange-bias effect at La0.75Sr0.25MnO3/LaNiO3 interfaces
- Centro Atomico Bariloche-CNEA, Rio Negro (Argentina); National Scientific and Technical Research Council, Buenos Aires (Argentina)
- Univ. of California, Berkeley, CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- National Scientific and Technical Research Council, Buenos Aires (Argentina); Centro Atomico Constituyentes-CNEA, San Martin (Argentina)
In this paper, we show that ferromagnetic/paramagnetic La0.75Sr0.25MnO3/LaNiO3 multilayers present an unexpected magnetic exchange-bias effect (EBE), observed in field-cooled magnetization loops. The exchange-bias field and the enhancement of the coercivity vanish around 50 K. We demonstrate that the oxidation state of the Ni and Mn cations changes from Mn3+-Ni3+ to Mn4+-Ni2+ in the layers close to the interface probed by x-ray absorption spectroscopy measurements. The variation of the valence states is accompanied by a change in the magnetic behavior of the cations at the La0.75Sr0.25MnO3/LaNiO3 interface, possibly giving rise to the formation of magnetic or magnetically frustrated regions that may pin the ferromagnetic a0.75Sr0.25MnO3 layers and explain the EBE.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1212102
- Report Number(s):
- LBNL-5650E
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 85, Issue 9; ISSN 1098-0121
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
Similar Records
Revival of Metal-Insulator and Ferromagnetic-Paramagnetic Transitions by Ni Substitution at Mn Site in Charge-Ordered Monovalent Doped Nd{sub 0.75}Na{sub 0.25}MnO{sub 3} Manganites
Effect of epitaxial strain on the exchange-bias properties of [La{sub 0.67}Ca{sub 0.33}MnO{sub 3}/La{sub 0.33}Ca{sub 0.67}MnO{sub 3}]{sub 15} multilayers: Resonant x-ray scattering measurements