X-ray photoelectron spectroscopy (XPS) study of Heusler alloy (Co₂FeAl) interfaced with semiconductor (n-Si) structure

Abstract

Layered magnetic heterostructures are very promising candidates in spintronics in which the influences of interfaces, surfaces and defects play a crucial role. X-ray photoelectron spectroscopy (XPS) study has been performed for studying in detail the chemical state and electronic structure of Co2FeAl (CFA) Heusler alloy interfaced with Si substrates. XPS survey scan spectra have clearly shown the presence of Fe, Co and Al signal along with the signal due to Si. The presence of Co, Fe and Al signal confirms the formation of CFA alloy phase. Our XPS results support our previous study [1] on CFA/Si structure in determining the magnetic and transport properties across the interface.

Nanoemulsion Technique for the Syntheses of N-Doped Porous Carbon Nanospheres and Their Application in Energy Storage Devices

“…The Fe 2p spectra of both N-PCNS-2.5 and N-PCNS-3.0 (Figure S3a,b) show two peaks at 710.71 and 723.9 eV corresponding to the p 3/2 and p 1/2 states, respectively. The gap between the two peaks is 13.2 eV, which is close to the actual value . However, as reflected from the data in Table , a small amount of iron can be detected in the samples, which arises from the polymerization initiator, FeCl 3 .…”

“…The gap between the two peaks is 13.2 eV, which is close to the actual value. 38 However, as reflected from the data in Table 2, a small amount of iron can be detected in the samples, which arises from the polymerization initiator, FeCl 3 . Peaks at 710.3 and 712.01 eV in the deconvoluted spectrum of Fe 2p 3/2 correspond to Fe 3+ and Fe 2+ , respectively.…”

Investigation on the Overlithiation Mechanism of LiCoO2 Cathode for Lithium Ion Batteries

“…29 After the 1.2 V over-discharge, the additional presence of the shake-up satellite peaks at the binding energies of 787.58 and 803.32 eV may be due to the CoO phase. 40 Remarkably, the Co 2p peaks almost disappear without etching after the electrode was initially over-discharged to 1.0 V. Then, after Ar-ion etching, the Co 2p peaks appear and the additional peaks at the binding energy positions of 778.89 eV (for Co 2p 3/2 ) and 793.58 eV (for Co 2p 1/2 ) are due to the Co metal (Fig. 5e).…”

Facile Electrodeposition of Mn-CoP Nanosheets on Ni Foam as High-Rate and Ultrastable Electrodes for Supercapacitors

“…39,40 The peak as appeared at 787.3 eV accounts for cobalt oxide or surface oxidized cobalt. 41 In the Co 2p 1/2 region, other two peaks ascribed to Co 0 and Co 2+ appeared at 791.5 and 797.0 eV, respectively. 39,42 The peak at 803.1 eV is a usually observed "satellite" peak in CoP.…”

“…The Co 2p spectrum is presented in Figure c. In the Co 2p 3/2 region, two peaks assigned to Co 0 and Co 2+ can be observed at 778.2 and 781.4 eV, respectively. , The peak as appeared at 787.3 eV accounts for cobalt oxide or surface oxidized cobalt . In the Co 2p 1/2 region, other two peaks ascribed to Co 0 and Co 2+ appeared at 791.5 and 797.0 eV, respectively. , The peak at 803.1 eV is a usually observed “satellite” peak in CoP. , For P 2p spectrum (Figure d), the peaks at 129.1 and 130.3 eV are attributed to P 2p 3/2 and P 2p 1/2 , respectively, which are assigned to the metal phosphides formed from reduced phosphorus. , The broad peak at 134.0 eV is due to the oxidized P species .…”