Abstract
In the recent past, heterostructures of magnetic oxide thin films have attracted a great deal of research excitement due to very interesting physical properties such as antiferromagnetic interlayer coupling, tunable exchange-bias, interfacial driven magnetic properties and high mobility electron gas across the interfaces. In this work, we report on the comprehensive magnetic properties observed from the heterostructures of (2 unit cells) La0.7Sr0.3CrO3/(8 unit cells) La0.7Sr0.3MnO3/(2 unit cells) La0.7Sr0.3CrO3, which are epitaxially deposited on SrTiO3 substrate by plasma-assisted oxide molecular beam epitaxy. Using SQUID magnetometer, the magnetic properties are studied when the magnetic field was applied both in plane and out of plane. The Curie temperature of this structure is found to be at 290 K. Most significantly, at 2 K, we observed a complete up/down shift (along magnetization axis) of hysteresis loop when the sample was cooled under a magnetic field of ± 5000 Oe in the in-plane configuration. We believe that the strong antiferromagnetic (super) exchange coupling of Mn-Cr across the two interfaces is responsible for the observed exchange bias. We will present and discuss our in-detailed experimental findings collected on this heterostructure as a function of temperature and magnetic field.
Highlights
Transition metal oxides (TMOs) are a group of compounds of increasing interest due to properties that make them prospective candidates for engineering applications and technologies
TMO thin films, heterostructures ranging from micro- (10-6 m) to nano-meters (10-9 m) in thickness, display interfacial interactions that can lead to effects such as antiferromagnetic interlayer coupling, tunable exchange bias, thickness dependent phase transitions, and high mobility of twodimensional electron gas across interfaces
The magnetic properties of LSCO/LSMO/LSCO deposited on STO have shown effects such as anti-ferromagnetic exchange coupling, exchange bias observed through asymmetry and a shift on the magnetic moment axis, and an indication of magnetic anisotropy
Summary
Transition metal oxides (TMOs) are a group of compounds of increasing interest due to properties that make them prospective candidates for engineering applications and technologies. The interfacial interactions leading to such phenomena stem from interactions occurring with lattice, charge, orbitals and spins giving rise to a sensitivity to strain, electric and magnetic fields, as well as chemical doping.. The interfacial interactions leading to such phenomena stem from interactions occurring with lattice, charge, orbitals and spins giving rise to a sensitivity to strain, electric and magnetic fields, as well as chemical doping.5 With these interesting properties, including magnetoresistance and half-metallic properties, TMO thin films can be applied towards applications in spintronics, magnetic sensors, and magnetic random-access memory.. Along with the FM and AFM exchange coupling are the effects of enhanced coercivity and asymmetry in magnetization reversal processes.7–9 Many of these exchange bias effects have occurred in other thin film systems.. Figures containing magnetic data are not refined with diamagnetic subtraction, it can be concluded that an accurate representation of the magnetic behavior of LSCO/LSMO/LSCO is observed
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