SUPERPARAMAGNETIC BEHAVIOR OF STRUCTURAL DOMAINS IN EPITAXIAL ULTRATHIN MAGNETITE FILMS

Authors
VOOGT FC PALSTRA TTM NIESEN L ROGOJANU OC JAMES MA HIBMA T
Citation
Fc. Voogt et al., SUPERPARAMAGNETIC BEHAVIOR OF STRUCTURAL DOMAINS IN EPITAXIAL ULTRATHIN MAGNETITE FILMS, Physical review. B, Condensed matter, 57(14), 1998, pp. 8107-8110
Citations number
26
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physical review. B, Condensed matter → ACNP
ISSN journal
01631829
Volume
57
Issue
14
Year of publication
1998
Pages
8107 - 8110
Database
ISI
SICI code
0163-1829(1998)57:14<8107:SBOSDI>2.0.ZU;2-P
Abstract
We provide evidence that thin films of magnetite Fe3O4 epitaxially gro wn on single-crystalline MgO(100), form domains with unique magnetic p roperties. Strong 180 degrees Fe-O-Fe superexchange paths at antiphase domain boundaries result in a frustration of the interdomain interact ions. Probe-layer Mossbauer spectroscopy shows superparamagnetic behav ior in the entire film, in spite of the nearly perfect layer-by-layer growth. Superconducting quantum interference device magnetometry is us ed to determine the temperature and thickness dependence of the superp aramagnetic blocking temperatures.