Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 18, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3130230
Keywords
coercive force; europium compounds; magnetic switching; magnetic thin films; magnetic tunnelling; magnetoresistance; spin dynamics
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Funding
- NSF [DMR 0504158]
- ONR [N00014-06-1-0235]
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EuS is a well established spin filter (SF) material and its magnetic properties are shown to be tunable with deposition temperature. In tunnel junctions consisting of double EuS SF barriers, different coercive fields of the two adjacent SFs are achieved by depositing one EuS layer at room temperature and quench condensing the other at liquid nitrogen temperature. A thin Al2O3 spacer layer is introduced in between to prevent direct magnetic coupling. Magnetoresistance with well defined spin-parallel and spin-antiparallel states is obtained this way, and the resistance change originates completely within the SF/I/SF composite tunnel barrier, with no ferromagnetic electrodes involved.
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