Surface magnetic phase transition of the double-exchange ferromagnet: Schwinger-boson mean-field study

Abstract

The surface magnetic phase transition of a double-exchange model for metallic manganites is studied using a Schwinger-boson mean-field method. About three unit-cells wide surface layers are identified. The magnetic moment in these layers decreases more rapidly than that in the bulk when the temperature is increased. This behavior is consistent with experimental observations. We also discuss the implication of this behavior on the tunneling magnetoresistance effect using manganites and possible improvement of the magnetoresistance effect near the bulk Curie temperature.

7 pages, 9 figures

References in corpus (5)

• Lattice relaxation, electronic screening, and spin and orbital phase diagram of LaTiO${}_3$/SrTiO${}_3$ superlattices
• Full Bulk Spin Polarization and Intrinsic Tunnel Barriers at the Surface of Layered Manganites
• Dynamical Mean Field Study of Model Double-Exchange Superlattices
• Interface ordering and phase competition in a model Mott-insulator--band-insulator heterostructure
• Large Magnetoresistance in a Manganite Spin-Tunnel-Junction Using LaMnO3 as Insulating Barrier

Cited by in corpus (2)

• Spin injection and spin transport in paramagnetic insulators
• Magnetic interaction at an interface between manganite and other transition metal oxides