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Title: Extraordinary Hall effect and universal scaling in Fe{sub x}(ZnO){sub 1–x} granular thin films at room temperature

On the benefit of the concept of the so-called diluted magnetic oxides, Fe{sub x}(ZnO){sub 1–x} (x = 0.50–0.85) granular thin films with different thickness through 2D and 3D percolation region were prepared by ion beam assisted deposition. All samples are ferromagnetic at room-temperature due to the ferromagnetic nature of the Fe-doped ZnO matrix, which is quite different from the superparamagnetic behavior in the insulator-matrix based granular films. Along with decreasing thickness, the Hall coefficient R{sub S} is largely enhanced. The maximum R{sub S} reaches 4.27 × 10{sup −7} m{sup 3}/C in ∼2.8 nm Fe{sub 0.6}(ZnO){sub 0.4} granular film, which is nearly 9 times larger than the R{sub S} (4.64 × 10{sup −8} m{sup 3}/C) of the ∼50 nm Fe{sub 0.6}(ZnO){sub 0.4} sample. Meanwhile, the R{sub S} could maintain in a wide temperature region from 10 K to 300 K and the Hall sensitivity reaches ∼130 V/AT at room-temperature. The scaling exponential of n = 1.7 ± 0.1 in σ{sub xy}∼σ{sub xx}{sup n} is observed, fitting well with the recent developed universal scaling theory characterized by n = 1.6 in the dirty limit.
Authors:
; ;  [1] ; ; ; ;  [1] ;  [2] ; ; ;  [3] ;  [4] ;  [5]
  1. Department of Electronics, Nankai University, Tianjin 300071 (China)
  2. (China)
  3. School of Material Science and Engineering, Tianjin University, Tianjin 300072 (China)
  4. Department of Physics, Tianjin University, Tianjin 300072 (China)
  5. School of Physics, The University of Sydney, Sydney, NSW 2006 (Australia)
Publication Date:
OSTI Identifier:
22395651
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 1; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DEPOSITION; DOPED MATERIALS; FERROMAGNETISM; HALL EFFECT; IRON COMPOUNDS; SENSITIVITY; SUPERPARAMAGNETISM; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0273-0400 K; THIN FILMS; ZINC OXIDES