Negative spin polarization of Mn2VGa probed by tunnel magnetoresistance

Klewe C, Meinert M, Schmalhorst J-M, Reiss G (2013)
J. Phys.: Condens. Matter 25(7): 076001.

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Abstract
The ferrimagnetic Heusler compound Mn2VGa is predicted to have a pseudogap inthe majority spin channel, which should lead to a negative tunnelmagnetoresistance. We synthesized epitaxial Mn2VGa thin films on MgO(001)substrates by dc and rf magnetron co-sputtering, resulting in nearlystoichiometric films. XRD analysis revealed a mostly B2-ordered structure forthe films deposited at substrate temperatures of 350{\deg}C, 450{\deg}C, and550{\deg}C. Magnetic tunnel junctions with MgO barrier and CoFecounter-electrodes were fabricated. After post-annealing at up toT_a=425{\deg}C negative TMR was obtained around zero bias, providing evidencefor the inverted spin-polarization. Band structures of both electrodes werecomputed within the coherent potential approximation and used to calculate theTMR(V) characteristics, which are in good agreement with our experimentalfindings.
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Klewe C, Meinert M, Schmalhorst J-M, Reiss G. Negative spin polarization of Mn2VGa probed by tunnel magnetoresistance. J. Phys.: Condens. Matter. 2013;25(7):076001.
Klewe, C., Meinert, M., Schmalhorst, J. - M., & Reiss, G. (2013). Negative spin polarization of Mn2VGa probed by tunnel magnetoresistance. J. Phys.: Condens. Matter, 25(7), 076001. doi:10.1088/0953-8984/25/7/076001
Klewe, C., Meinert, M., Schmalhorst, J. - M., and Reiss, G. (2013). Negative spin polarization of Mn2VGa probed by tunnel magnetoresistance. J. Phys.: Condens. Matter 25, 076001.
Klewe, C., et al., 2013. Negative spin polarization of Mn2VGa probed by tunnel magnetoresistance. J. Phys.: Condens. Matter, 25(7), p 076001.
C. Klewe, et al., “Negative spin polarization of Mn2VGa probed by tunnel magnetoresistance”, J. Phys.: Condens. Matter, vol. 25, 2013, pp. 076001.
Klewe, C., Meinert, M., Schmalhorst, J.-M., Reiss, G.: Negative spin polarization of Mn2VGa probed by tunnel magnetoresistance. J. Phys.: Condens. Matter. 25, 076001 (2013).
Klewe, Christoph, Meinert, Markus, Schmalhorst, Jan-Michael, and Reiss, Günter. “Negative spin polarization of Mn2VGa probed by tunnel magnetoresistance”. J. Phys.: Condens. Matter 25.7 (2013): 076001.
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PMID: 23327939
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arXiv 1210.2966

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