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Magnetotransport and Trapping of Magnetic Domain Walls in Spin Valves With Nanoconstrictions
Noh, S. J.,Chun, B. S.,Wu, H. C.,Shvets, I. V.,Chu, I. C.,Abid, M.,Serrano-Guisan, S.,Kim, Y. K. IEEE 2011 IEEE transactions on magnetics Vol.47 No.10
<P>In a magnetic nanowire, a magnetic domain wall (DW) can move along the wire when an applied magnetic field or a spin-polarized current is applied. A magnetic spin-valve device composed of two nanowires connected by a nanosized constriction was prepared, on which the presence of a pinned DW by nanoconstriction was detected by giant magnetoresistance effect. When the magnetic wire has a nanoconstriction, the DW configuration and width were largely affected by the shape of nanoconstriction. An asymmetric magnetotransport behavior observed in the experiments was interpreted by a micromagnetic modeling study.</P>
Chun, B.S.,Kim, K.H.,Leibing, N.,Serrano-Guisan, S.,Schumacher, H.W.,Abid, M.,Chu, I.C.,Mryasov, O.N.,Kim, D.K.,Wu, H.C.,Hwang, C.,Kim, Y.K. Elsevier Science 2012 ACTA MATERIALIA Vol.60 No.19
We report the correlation between the crystalline structure, electronic structure and magnetic properties of Co<SUB>2</SUB>FeAl films as a function of growing temperature both experimentally and theoretically. The Co<SUB>2</SUB>FeAl film grown at room temperature is initially in the partially disordered B2 state, but then it gains a much higher ordered structure with increasing growing temperature due to its transition from short-range to long-range crystallographic order by surface diffusion. Electron energy loss spectroscopy measurements reveals that the increase in the I(L3)/I(L2) ratio of Co can be attributed to the enhanced ferromagnetic exchange interaction between neighboring Co atoms and the fact that the Co contribution is more dominant than the Fe contribution. As the growing temperature increases, many more unoccupied 3d states in Co are observed, hence the Gilbert damping constant increases due to a strong spin-orbit interaction. We also present the results of highly accurate quasiparticle self-consistent GW calculations and confirm that Co<SUB>2</SUB>FeAl in an ideal L2<SUB>1</SUB> structure is indeed a half-metal with a well-defined band gap in the minority spin channel.