Magnetic and transport properties of amorphous Ge-Mn thin films

S. H. Song, Sang Ho Lim, M. H. Jung, T. S. Santos, J. S. Moodera

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The magnetic and transport properties are investigated in well-characterized Ge1-xMnx (x in at.%) amorphous semiconductor thin films for a large range of Mn compositions, prepared by using thermal co-evaporation onto oxidized Si or glass substrates held either at room temperature or quench condensed onto LN2-cooled surface. Magnetic hysteresis measurements at room temperature show saturation occurring by 1 - 2 kOe for all samples. The temperature dependence of the magnetization between 4 K and 300 K, measured at an applied field of 15 kOe and for zero-field cooled condition, exhibit a concave shape, different from the usual Brillouin behavior. The saturation magnetization at room temperature is found to range from 0.5 to 7 emu/cc. The highest magnetic moment observed per Mn ion is 0.76 Bohr magneton (μB) at 4 K at an intermediate composition x = 38.5 %. At x = 16.7 % where detailed transport measurements are carried out, the anomalous Hall effect is observed at 300 K, and the temperature dependence of the Hall effect is rather complicated. The magnetoresistance, being ∼1 % at an applied field of 50 kOe, changes sign at around 200 K.

Original languageEnglish
Pages (from-to)2386-2396
Number of pages11
JournalJournal of the Korean Physical Society
Volume49
Issue number6
Publication statusPublished - 2006 Dec 1

Keywords

  • Amorphous Ge-Mn thin films
  • Diluted magnetic semiconductors
  • High Curie temperature
  • Magnetic properties
  • Transport properties

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Song, S. H., Lim, S. H., Jung, M. H., Santos, T. S., & Moodera, J. S. (2006). Magnetic and transport properties of amorphous Ge-Mn thin films. Journal of the Korean Physical Society, 49(6), 2386-2396.