Substrate effects on magnetic properties of LSMO thin films.
ORAL
Abstract
Temperature and magnetic field dependence of magnetization in LSMO films of 7.6 and 13.2 nm thicknesses grown on SrTiO3 (100) and LaAlO3 (100) substrates, respectively, were investigated by vibrating sample magnetometer. Coercive field (HC), exchange bias (Hε), and saturation magnetization (MS) were measured from zero-field-cooled hysteresis loops at 5 K. HC and Hε are determined at 5 K using the relation, HC = (HC1 + HC2)/2 and Hε = (HC1 - HC2)/2, where HC2 and HC2 are the two magnetic fields where magnetization changes sign in hysteresis loops. Results show that MS values are 476, 210 emu/cm3 and Hc values are 142, 655 Oe for LSMO film grown on SrTiO3 and LaAlO3 respectively. The sample grown on LaAlO3 has Hε ∼ -98 Oe which suggests the possible presence of both ferromagnetic and antiferromagnetic phases while the LSMO film on SrTiO3 does not have an exchange bias. Further studies on understanding the effect of the substrate on magnetic properties of LSMO are in process.
*We acknowledge funding support from NSF (DMR-1608656) for growth and optimization and DOE (DE- SC0016176) for theory support.
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Presenters
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Navid Mottaghi
- Physics and Astronomy, West Virginia Univ
- Physics and Astronomy department , West Virginia University
- Physics and astronomy, West Virginia Univ