Measurements of interfacial spin-polarization of ferromagnetic materials with the use of epitaxial NbN junctions
Year: 2009
Type: article
Abstract: Epitaxial NbN/ferromagnetic material (Co and Co2MnGe) multilayers have been grown on MgO (100) substrate and the spin polarization of the ferromagnetic materials has been investigated by using the multilayer junctions. The Co2MnGe layers have been deposited on MgO//NbN and the inverted structure (NbN layers on Co2MnGe films) has been also made. The epitaxial relationship between NbN and Co2MnGe layers with an in-plane 45°rotation was confirmed for the two types of multilayer structures. Andreev reflection measurements on these junctions and the modified Blonder-Tinkham-Klapwijk (BTK) analysis have shown that the spin polarization values of Co and Co2MnGe are 0.38 and 0.51, respectively. These values are in good agreement with previous data obtained by using the point-contact Andreev reflection (PCAR) technique. The results suggest the potential of the epitaxial NbN junction method as a measurement technique of spin polarization.
DOI: 10.14723/tmrsj.34.59
Authors: K. Kurachi, T. Kuroda, T. Ono, Y. Takeda, H. Asano
Institution: Nagoya University
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W1731430316