scholarly journals A Landau-Ginzburg Description of Sb Overlayers

2001 ◽  
Vol 674 ◽  
Author(s):  
R. Skomski ◽  
T. Komesu ◽  
H.-K. Jeong ◽  
C. N. Borca ◽  
P. A. Dowben ◽  
...  
Keyword(s):  
Spin Polarization ◽  
Heusler Alloy ◽  
Function Approximation ◽  
Gaussian Approximation ◽  
Temperature Dependent ◽  
Half Metallic ◽  
Spin Polarized ◽  
Spin Excitations ◽  
Injection Depth ◽  
Inverse Photoemission Spectroscopy

ABSTRACTThe spin polarization of Sb overlayers on the semi-Heusler alloy NiMnSb is investigated in terms of the Landau-Ginzburg approach. The half-metallic semi-Heusler alloy NiMnSb acts as a ferromagnetic perturbation and induces a spin polarization in the semimetallic Sb overlayer. Using a Gaussian approximation, the propagation of the spin perturbation in the overlayer is calculated. The results are compared with spin-polarized inverse photoemission spectroscopy (SPIPES) results and with recent spin-dependent envelope-function approximation (SDEFA) predictions. The Landau-Ginzburg parameters are both band-structure and temperature dependent, and it is argued that thermal spin excitations lead to an injection depth decreasing as 1//T law at high temperatures.

Ferromagnetic Material of the Nearly Half-Metallic Alloy Co2TiGa

2013 ◽  
Vol 690-693 ◽  
pp. 590-593 ◽  
Author(s):  
Hong Pei Han
Keyword(s):  
Spin Polarization ◽  
Heusler Alloy ◽  
Ferromagnetic Material ◽  
Full Potential ◽  
Half Metallic ◽  
Augmented Plane Wave ◽  
Plane Wave Method ◽  
Linearized Augmented Plane Wave ◽  
Full Heusler ◽  
Metallic Ferromagnetism

The structure, electronic and magnetic properties of full-Heusler alloy Co2TiGa are investigated by means of the full potential linearized augmented plane-wave method. Our results show that the ground state of Co2TiGa is of the nearly half-metallic ferromagnetism with a magnetic moment of 1.00218μBper unit cell, which are contributed by the atoms Co and Ti. Meanwhile, the spin polarization around the Fermi level is up to 93.2%, almost 100%, which indicates that full-Heusler alloy Co2TiGa with the well magnetism and spin polarization would be possibly applied to the field of the material engineering and information technology.

Quantification of site disorder and its role on spin polarization in the nearly half-metallic Heusler alloy NiFeMnSn

2016 ◽  
Vol 94 (21) ◽  
Author(s):  
M. D. Mukadam ◽  
Syamashree Roy ◽  
S. S. Meena ◽  
Pramod Bhatt ◽  
S. M. Yusuf
Keyword(s):  
Spin Polarization ◽  
Heusler Alloy ◽  
Half Metallic ◽  
Site Disorder

scholarly journals Tunnel magnetoresistance effect and magnetic damping in half-metallic Heusler alloys

2011 ◽  
Vol 369 (1948) ◽  
pp. 3037-3053 ◽  
Author(s):  
M. Oogane ◽  
S. Mizukami
Keyword(s):  
Spin Polarization ◽  
High Spin ◽  
Heusler Alloy ◽  
Heusler Alloys ◽  
Magnetoresistance Effect ◽  
Half Metallicity ◽  
Half Metallic ◽  
Tunnel Magnetoresistance ◽  
Magnetic Damping ◽  
High Spin Polarization

Some full-Heusler alloys, such as Co 2 MnSi and Co 2 MnGe, are expected to be half-metallic ferromagnetic material, which has complete spin polarization. They are the most promising materials for realizing half-metallicity at room temperature owing to their high Curie temperature. We demonstrate a huge tunnel magnetoresistance effect in a magnetic tunnel junction using a Co 2 MnSi Heusler alloy electrode. This result proves high spin polarization of the Heusler alloy. We also demonstrate a small magnetic damping constant in Co 2 FeAl epitaxial film. The very high spin polarization and small magnetic constant of Heusler alloys will be a great advantage for future spintronic device applications.

scholarly journals The antiphase boundary in half-metallic Heusler alloy Co2Fe(Al,Si): atomic structure, spin polarization reversal, and domain wall effects

2016 ◽  
Vol 109 (22) ◽  
pp. 222405 ◽  
Author(s):  
Zlatko Nedelkoski ◽  
Ana M. Sanchez ◽  
Arsham Ghasemi ◽  
Kohei Hamaya ◽  
Richard F. L. Evans ◽  
...  
Keyword(s):  
Domain Wall ◽  
Spin Polarization ◽  
Atomic Structure ◽  
Heusler Alloy ◽  
Antiphase Boundary ◽  
Polarization Reversal ◽  
Wall Effects ◽  
Half Metallic

Perovskite R{\bar 3}c phase AgCuF3: multiple Dirac cones, 100% spin polarization and its thermodynamic properties

2019 ◽  
Vol 75 (3) ◽  
pp. 354-360
Author(s):  
Minquan Kuang ◽  
Tingzhou Li ◽  
Zhenxiang Cheng ◽  
Houari Khachai ◽  
R. Khenata ◽  
...  
Keyword(s):  
Thermodynamic Properties ◽  
Spin Polarization ◽  
Spin Orbit Coupling ◽  
Dynamic Simulations ◽  
Metallic Behavior ◽  
Half Metallic ◽  
Spin Polarized ◽  
Different Temperatures ◽  
The Stability ◽  
Thermal Volume Expansion

Very recently, experimentally synthesized R{\bar 3}c phase LaCuO3 was studied by Zhang, Jiao, Kou, Liao & Du [J. Mater. Chem. C (2018), 6, 6132–6137], and they found that this material exhibits multiple Dirac cones in its non-spin-polarized electronic structure. Motivated by this study, the focus here is on a new R{\bar 3}c phase material, AgCuF3, which has a combination of multiple Dirac cones and 100% spin polarization properties. Compared to the non-spin-polarized system LaCuO3, the spin-polarized Dirac behavior in AgCuF3 is intrinsic. The effects of on-site Coulomb interaction, uniform strain and spin–orbit coupling were added to examine the stability of its multiple Dirac cones and half-metallic behavior. Moreover, the thermodynamic properties under different temperatures and pressures were investigated, including the normalized volume, thermal volume expansion coefficient, heat capacity at constant volume and Debye temperature. The thermal stability and the phase stability of this material were also studied via ab initio molecular dynamic simulations and the formation energy of the material, respectively.

Spin polarization of field-emitted electrons from ferromagnetic half-metallic Heusler alloy Co2MnSi

2008 ◽  
Vol 40 (13) ◽  
pp. 1673-1676 ◽  
Author(s):  
Shigekazu Nagai ◽  
Yuji Fujiwara ◽  
Koichi Hata
Keyword(s):  
Spin Polarization ◽  
Heusler Alloy ◽  
Half Metallic
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