Antiferromagnetism at the YBa2Cu3O7 / La2/3Ca1/3MnO3 interface
N. Haberkorn, J. Guimpel, M. Sirena, L. B. Steren, W. Saldarriaga, E., Baca, M. E. G\'omez
TL;DR
This study investigates magnetic properties of YBa2Cu3O7/La2/3Ca1/3MnO3 superlattices, revealing unexpected exchange bias effects indicative of antiferromagnetic interfaces influenced by interface disorder and Mn valence shifts.
Contribution
It reports the discovery of exchange bias at F/AF interfaces in YBCO/LCMO superlattices, highlighting the presence of antiferromagnetic regions at the interface, which is a novel observation.
Findings
Exchange bias observed at low temperatures.
Blocking temperature depends on layer thickness.
Exchange bias field inversely proportional to FM layer thickness.
Abstract
The magnetic properties of a series of YBa2Cu3O7-x/La2/3Ca1/3MnO3 (YBCO/LC1/3MO) superlattices grown by dc sputtering at high oxygen pressures (3.5 mbar) show the expected ferromagnetic behaviour. However, field cooled hysteresis loops at low temperature show the unexpected existence of exchange bias, effect associated with the existence of ferromagnetic/antiferromagnetic (F/AF) interfaces. The blocking temperature (TB) is found thickness dependent and the exchange bias field (HEB) is found inversely proportional to the FM layer thickness, as expected. The presence of an AF material is probably associated to interface disorder and Mn valence shift towards Mn4+.
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