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Title: Structure and magnetism of nanocrystalline and epitaxial (Mn,Zn,Fe)3O4 thin films

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.3676619· OSTI ID:1212096
 [1];  [1];  [2];  [1];  [3];  [4];  [3]
  1. Univ. of California, Berkeley, CA (United States)
  2. Univ. of California, Berkeley, CA (United States) ; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Univ. of California, Berkeley, CA (United States) ; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
+ Show Author Affiliations

We study nanocrystalline (NC) textured Mn0.5Zn0.6Fe1.9O4 (MZFO) films, grown at room temperature on both isostructural and non-isostructural substrates, that show magnetization values significantly suppressed from epitaxial MZFO films. X-ray absorption spectroscopy and x-ray magnetic circular dichroism measurements indicate larger ratios of Fe3+ to Fe2+ ions on the tetrahedral sites in the NC films compared to the epitaxialfilms. The magnetization loops of the NC films are shifted by 200-400 Oe at low temperatures. No such effect is observed in the epitaxialfilms. In conclusion, we hypothesize that the presence of a more structurally disordered, possibly magnetically frustrated, matrix exchange biases the crystalline regions.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); US Department of the Navy, Office of Naval Research (ONR); National Science Foundation (NSF); US Army Research Office (ARO)
DOE Contract Number:
AC02-05CH11231; N00014-10-1-0226; W911NF-08-1-0317; 0604277; 1104401
OSTI ID:
1212096
Report Number(s):
LBNL-5644E; JAPIAU
Journal Information:
Journal of Applied Physics, Vol. 111, Issue 7; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
Epitaxy
Magnetic films
Thin films
Thin film structure
Thin film growth