Ferromagnetism of self‐organized Ge 1–x Mn x nano‐pillars

Autor: J. Rothman, P. Bayle Guillemaud, M. Jamet, Richard Mattana, R. Dujardin, V. Poydenot, Joel Cibert, Serge Tatarenko, A. Barski, Thibaut Devillers, E. Bellet Amalric
Rok vydání: 2006
Předmět:
Zdroj: physica status solidi c. 3:4123-4126
ISSN: 1610-1642
1862-6351
DOI: 10.1002/pssc.200672806
Popis: In the search for high-TC Si or Ge based ferromagnetic semiconductors, we present here the magnetic and transport properties of Ge1–xMnx nano-pillars. These pillars self-organize during the MBE growth of thin Mn doped (6%) Ge films as a consequence of the in-plane and out-of-plane diffusion of Mn atoms. Their composition is close to Ge2Mn and their average diameter and spacing are 3 nm and 10 nm respectively. Magnetic measurements evidence a ferromagnetic phase up to 400 K giving rise to anomalous Hall effect at room temperature. Moreover we evidence a large positive magnetoresistance (up to 7000% at 30 K and 9 T) probably due to the conductivity mismatch between the Mn-rich nano-pillars and the Mn-poor surrounding Ge matrix. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
Databáze: OpenAIRE
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