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Title: Investigation of magnetic proximity effect in Ta/YIG bilayer Hall bar structure

In this work, the investigation of magnetic proximity effect was extended to Ta which has been reported to have a negative spin Hall angle. Magnetoresistance (MR) and Hall measurements for in-plane and out-of-plane applied magnetic field sweeps were carried out at room temperature. The size of the MR ratio observed (∼10{sup −5}) and its magnetization direction dependence are similar to that reported in Pt/yttrium iron garnet, both of which can be explained by the spin Hall magnetoresistance theory. Additionally, a flip of magnetoresistance polarity is observed at 4 K in the temperature dependent measurements, which can be explained by the magnetic proximity effect induced anisotropic magnetoresistance at low temperature. Our findings suggest that both magnetic proximity effect and spin Hall magnetoresistance have contribution to the recently observed unconventional magnetoresistance effect.
Authors:
 [1] ;  [2] ; ;  [1] ; ;  [3] ;  [4]
  1. Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117583 (Singapore)
  2. (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602 (Singapore)
  3. Institute of Materials Research and Engineering, A-STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602 (Singapore)
  4. Temasek Laboratories, National University of Singapore, T-Lab Building, 5A Engineering Drive 1, 09-02, Singapore 117411 (Singapore)
Publication Date:
OSTI Identifier:
22273838
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 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; ANISOTROPY; FERRITE GARNETS; HALL EFFECT; IRON OXIDES; LAYERS; MAGNETIC FIELDS; MAGNETIZATION; MAGNETORESISTANCE; PROXIMITY EFFECT; SPIN; TANTALUM; TEMPERATURE DEPENDENCE; YTTRIUM COMPOUNDS