Heusler alloy/semiconductor hybrid structures

Structural and Magnetic Characterization of NiMnSb Half-Heusler Alloy Prepared by Rapid Quenching

“…Via tting our curves for this model we have obtained the local values of the spin polarization parameter P scattered in the range 35-50%, depending on the point-contact tip position. Typically, the measured spin polarizations for NiMnSb bulk alloys are in the range of 44-100% [3]. The lower value of spin polarization could be ascribed to small o-stoichiometric composition of our sample.…”

“…2). Typical T C for NiMnSb should be in range of 730-1112 K [3]. The spin polarization parameter P has been determined from tting of the PCAR spectra measured on dierent Nb-NiMnSb point-contacts (at T = 1.5 K) using the two-channel model of Strijkers et al for spinpolarized PCAR currents I P C [7].…”

Si segregation in polycrystalline Co2MnSi films with grain-size control

“…The lattice constant of the Co 2 MnSi film is estimated to be 0.5619 nm, which is within a 1% mismatch of the reported bulk value 0.56540 nm. 6 A small Co 2 MnSi͑220͒ peak is also visible for V T = −750 V, however, the peak almost disappears with decreasing magnitude of V T . Our XRD sensitivity, however, does not allow us to characterize the remaining films as well as to evaluate the ordering of the Co 2 MnSi matrix.…”

“…7 This is also consistent with data from X-ray magnetic circular dichroism studies in similar Co-based Heulser alloy films. 6,8 In addition, for our sputtering system, the packing density of similar films has been measured to be approximately 90%. 9 Therefore about 49% of the saturation magnetization is expected as compared with that of an epitaxial Co 2 MnSi film.…”

“…For these samples, the measured magnetic moment per formula unit is less than 65% of the calculated value from a generalized Slater-Pauling curve ͑5 B / f.u.͒. 6 For the Co 2 MnSi film with an average grain size of 18 nm, corresponding to the sample grown at V = −750 V, the volume of the bulk Co 2 MnSi matrices is calculated to be 54% of the total volume. This corresponds to a three-monolayerthick disordered surface or interface region as previously reported for epitaxial films.…”