Journal
PHYSICAL REVIEW B
Volume 81, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.155122
Keywords
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Funding
- State Key Project of Fundamental Research of Ministry of Science and Technology (MOST) [2006CB932200, 2010CB934400]
- National Natural Science Foundation (NSFC) [10874225, 50928101, 50721001]
- Beijing Municipal Commission of Education
- K. C. Wong Education Foundation, Hong Kong
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We show that the Coulomb blockade voltage can be made to depend strongly on the electron spin in a discontinuous magnetic granular layer inserted in the middle of an insulating layer of a tunnel junction. This strong spin dependence is predicted from the local intergranular magnetoresistance effects, including giant magnetoresistance (GMR), tunneling magnetoresistance, colossal magnetoresistance, or GMR through a polymer spacer. The resulting Coulomb blockade magnetoresistance (CBMR) ratio can exceed the magnetoresistance ratio of the granular layer itself by orders of magnitude. Unlike other magnetoresistance effects, the CBMR effect does not require magnetic electrodes.
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