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Observation of Large Low Field Magnetoresistance in Ramp-Edge Tunneling Junctions Based on Doped Manganite Ferromagnetic Electrodes and A SrTiO3 Insulator

Published online by Cambridge University Press:  10 February 2011

C. Kwon ,
Q. X. Jia ,
Y. Fan ,
M. F. Hundley ,
D. W. Reagor ,
M. E. Hawley  and
D. E. Peterson
C. Kwon
Affiliation:
Materials Science and Technology Division, Mail Stop K763 Los Alamos National Laboratory, Los Alamos, NM 87545
Q. X. Jia
Affiliation:
Materials Science and Technology Division, Mail Stop K763 Los Alamos National Laboratory, Los Alamos, NM 87545
Y. Fan
Affiliation:
Materials Science and Technology Division, Mail Stop K763 Los Alamos National Laboratory, Los Alamos, NM 87545
M. F. Hundley
Affiliation:
Materials Science and Technology Division, Mail Stop K763 Los Alamos National Laboratory, Los Alamos, NM 87545
D. W. Reagor
Affiliation:
Materials Science and Technology Division, Mail Stop K763 Los Alamos National Laboratory, Los Alamos, NM 87545
M. E. Hawley
Affiliation:
Materials Science and Technology Division, Mail Stop K763 Los Alamos National Laboratory, Los Alamos, NM 87545
D. E. Peterson
Affiliation:
Materials Science and Technology Division, Mail Stop K763 Los Alamos National Laboratory, Los Alamos, NM 87545
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Abstract

We report the fabrication of ferromagnet-insulator-ferromagnet junction devices using a ramp-edge geometry based on (La0.7Sr0.3)MnO3 ferromagnetic electrodes and a SrTiO3 insulator. The multilayer thin films were deposited using pulsed laser deposition and the devices were patterned using photolithography and ion milling. As expected from the spin-dependent tunneling, the junction magnetoresistance depends on the relative orientation of the magnetization in the electrodes. The maximum junction magnetoresistance (JMR) of 30 % is observed below 300 Oe at low temperatures (T < 100 K).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 494: Symposium V – Science & Technology of Magnetic Oxides , 1997 , 237
Copyright
Copyright © Materials Research Society 1998

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References

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