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Negative anisotropic magnetoresistance in 3d metals and alloys containing iridium

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3 Author(s)
McGuire, T.R. ; IBM Research Center, Yorktown Heights, NY, U.S.A. ; Aboaf, J.A. ; Klokholm, E.

A study of anisotropic magnetoresistance (MR) has shown that the addition of Ir to Ni, Co, Fe, Fe.2Ni.8and Co.3Ni.7crystalline films causes a negative MR. These negative values occur at room temperature as well as at low temperatures. The MR as defined by \Delta \rho =\rho _{\parallel}-\rho _{\perp } , where the ∥ and \perp refer to the direction of magnetization relative to the electrical measuring current, can have values \Delta \rho \approx -.75\mu\Omega cm in Co-Ir. At Ir content of 3% the ratio \Delta \rho/\rho_{ave} is -2.6%. Comparisons are made with other alloy systems, and the implication of negative values of \Delta \rho on theoretical models is considered.

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Magnetics, IEEE Transactions on  (Volume:20 ,  Issue: 5 )