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Observation and interpretation of negative remanent magnetization and inverted hysteresis loops in a thin film of La0.7Sr0.3MnO3.

A new interesting article has been published in J Phys Condens Matter. 2018 Oct 10;30(40):405804. doi: 10.1088/1361-648X/aade14. Epub 2018 Aug 31. and titled:

Observation and interpretation of negative remanent magnetization and inverted hysteresis loops in a thin film of La0.7Sr0.3MnO3.

Authors of this article are:
Mottaghi N1, Trappen RB, Kumari S, Huang CY, Yousefi S, Cabrera GB, Aziziha M, Haertter A, Johnson MB, Seehra MS, Holcomb MB.

A summary of the article is shown below:
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. 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.
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