Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 55: Poster II

MA 55.83: Poster

Freitag, 4. April 2014, 10:30–13:30, P2

Magnetic properties in hydrogenated Li doped ZnO microwires — •Israel Lorite¹, Carlos Ivan Zalandazini², Silvia Perez², and Pablo Esquinazi¹ — ¹Division of Superconductivity and Magnetism, Institute for experimental Physics II, Fakultät für Physik und Geowissenschaften, Linnéstrasse 5, 04103 Leipzig, Germany — ²Laboratorio de Física del Sólido, Dpto. de Física, FCEyT, Universidad Nacional de Tucumán, 4000 Tucumán, Argentina

We have studied the magneto-transport properties of ZnO and Li doped ZnO treated with H plasma at room temperature, ZH and ZLH respectively. After plasma treatment a negative magnetoresistance, in perpendicular configuration, of ~1% and ~3.5% at 8T applied field is measured at 10K for ZH and ZLH, respectively. The magneto resistance can be well explained by a semi empirical model taking into account local magnetic moments and the s-d exchange interaction. A comparison with parallel configuration indicates possible anisotropy in the magneto resistance indicative of the appearance of magnetic order, further observed by SQUID. Finally, it has been found a minimum of magneto-resistance at 125 K for ZLH sample. It can be interpreted by means of two different parallel contributions: due to the VRH mechanism, below 125 K, and due to exchange interaction contribution above 125 K.