Observation and interpretation of negative remanent magnetization and inverted hysteresis loops in a thin film of La0.7Sr0.3MnO3
The observation of inverted magnetic hysteresis loops and negative magnetic remanence (NRM) in a 7.6 nm thin film of La0.7Sr0.3MnO3 grown on SrTiO3 substrates is reported here. The film was grown employing pulsed laser deposition and characterized by reflection high-energy electron diffraction during growth and using x-ray reflectivity measurements post-growth. Magnetic properties of the film were measured from 5 K to 400 K under both the field-cooled (FC) and zero-field-cooled (ZFC) conditions. The observed results of inverted magnetic hysteresis loops and NRM are interpreted in terms of the co-existence of a magnetically inhomogeneous region consisting of superparamagnetic spin clusters with a blocking temperature $$T_B$$ = 240 K and the ferromagnetic state with an ordering temperature $$T_C$$ = 290 K. Hysteresis loop inversion is observed in the temperature region of $$T_B < T < T_C$$ whereas NRM appears in the mixed superparamagnetic and ferromagnetic states for $$T < T_C$$ down to 5 K. These observations of hysteresis loop inversion and NRM are related to the magneto-static interaction between the superparamagnetic and ferromagnetic phases leading to anti-alignment of spin of both magnetic phases with respect to each other.
- Research Organization:
- West Virginia Univ., Morgantown, WV (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- DOE Contract Number:
- SC0016176
- OSTI ID:
- 1593999
- Journal Information:
- Journal of Physics. Condensed Matter, Vol. 30, Issue 40; ISSN 0953-8984
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
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