skip to main content

Title: Temperature driven transition from giant to tunneling magneto-resistance in Fe{sub 3}O{sub 4}/Alq{sub 3}/Co spin Valve: Role of Verwey transition of Fe{sub 3}O{sub 4}

We demonstrate interface energy level engineering, exploiting the modification in energy band structure across Verwey transition temperature (T{sub V}) of Fe{sub 3}O{sub 4}, in a Fe{sub 3}O{sub 4}(111)/Alq{sub 3}/Co spin-valve (SV). I-V characteristics exhibit a transition in conduction mode from carrier injection to tunneling across T{sub V} of Fe{sub 3}O{sub 4} electrode. Both giant magneto-resistance (GMR) and tunneling MR (TMR) have been observed in a single SV, below and above T{sub V}, respectively. We have achieved room-temperature SV operation in our device. We believe that the tuning of charge gap at Fermi level across T{sub V} resulting in a corresponding tuning of conduction mode and a unique cross over from GMR to TMR.
Authors:
; ; ; ;  [1]
  1. UGC-DAE Consortium for Scientific Research (CSR), University Campus, Khandwa Road, Indore 452 001 (India)
Publication Date:
OSTI Identifier:
22273862
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; ALUMINIUM COMPOUNDS; COBALT; ELECTRODES; ELECTRONIC STRUCTURE; FERMI LEVEL; FERRITES; HETEROJUNCTIONS; INTERFACES; IRON OXIDES; MAGNETORESISTANCE; ORGANIC COMPOUNDS; SPIN; TEMPERATURE DEPENDENCE; TRANSITION TEMPERATURE; TUNNEL EFFECT; VALVES