title: Detection of Defect-Induced Magnetism in Low-Dimensional ZnO Structures by Magnetophotocurrent.
abstract: The detection of defect-induced magnetic order in single low-dimensional oxide structures is in general difficult because of the relatively small yield of magnetically ordered regions. In this work, the effect of an external magnetic field on the transient photocurrent measured after light irradiation on different ZnO samples at room temperature is studied. It has been found that a magnetic field produces a change in the relaxation rate of the transient photocurrent only in magnetically ordered ZnO samples. This rate can decrease or increase with field, depending on whether the magnetically ordered region is in the bulk or only at the surface of the ZnO sample. The phenomenon reported here is of importance for the development of magneto-optical low-dimensional oxides devices and provides a new guideline for the detection of magnetic order in low-dimensional magnetic semiconductors.
authors.affiliation: Division of Superconductivity and Magnetism, Institut für Experimentelle Physik II, Fakultät für Physik und Geowissenschaften, Universität Leipzig, Linnéstrasse 5, 04103, Leipzig, Germany.
authors.forename: Israel
authors.initials: I
authors.lastname: Lorite
authors.affiliation: Division of Superconductivity and Magnetism, Institut für Experimentelle Physik II, Fakultät für Physik und Geowissenschaften, Universität Leipzig, Linnéstrasse 5, 04103, Leipzig, Germany.
authors.forename: Yogesh
authors.initials: Y
authors.lastname: Kumar
authors.affiliation: Division of Superconductivity and Magnetism, Institut für Experimentelle Physik II, Fakultät für Physik und Geowissenschaften, Universität Leipzig, Linnéstrasse 5, 04103, Leipzig, Germany.
authors.forename: Pablo
authors.initials: P
authors.lastname: Esquinazi
authors.affiliation: Laboratorio de Física del Sólido, Departamento de Física, Facultad de Ciencias Exactas y Tecnología, Universidad Nacional de Tucumán, Avda. Independencia 1800, 4000, Tucumán, Argentina.
authors.forename: Carlos
authors.initials: C
authors.lastname: Zandalazini
authors.affiliation: Laboratorio de Física del Sólido, Departamento de Física, Facultad de Ciencias Exactas y Tecnología, Universidad Nacional de Tucumán, Avda. Independencia 1800, 4000, Tucumán, Argentina.
authors.forename: Silvia Perez
authors.initials: SP
authors.lastname: de Heluani
keywords: low-dimensional oxide structures; magnetism; transient photocurrent; zinc oxide (ZnO)