Epitaxial Heusler Alloys: New Materials for Semiconductor Spintronics

MRS Bulletin ◽  
2003 ◽  
Vol 28 (10) ◽  
pp. 725-728 ◽  
Author(s):  
Chris Palmstrøm
Keyword(s):  
Crystal Structures ◽  
High Spin ◽  
Heusler Alloys ◽  
Compound Semiconductors ◽  
Great Promise ◽  
Lattice Matching ◽  
Spin Polarized ◽  
Semiconductor Spintronics ◽  
High Spin Polarization ◽  
Curie Temperatures

AbstractFerromagnetic materials that have Curie temperatures above room temperature, crystal structures and lattice matching compatible with compound semiconductors, and high spin polarizations show great promise for integration with semiconductor spintronics. Heusler alloys have crystal structures (fcc) and lattice parameters similar to many compound semiconductors, high spin polarization at the Fermi level, and high Curie temperatures. These properties make them particularly attractive for injectors and detectors of spin-polarized currents. This review discusses the progress and issues related to integrating full and half Heusler alloys into ferromagnetic compound semiconductor heterostructures.

High Spin Polarization of Conduction Band Electrons in GaAs-GaAsP Strained Layer Superlattice Fabricated as a Spin-Polarized Electron Source

2004 ◽  
Vol 43 (6A) ◽  
pp. 3371-3375 ◽  
Author(s):  
Tetsuya Matsuyama ◽  
Hisaya Takikita ◽  
Hiromichi Horinaka ◽  
Kenji Wada ◽  
Tsutomu Nakanishi ◽  
...  
Keyword(s):  
Conduction Band ◽  
Spin Polarization ◽  
High Spin ◽  
Electron Source ◽  
Strained Layer ◽  
Spin Polarized ◽  
High Spin Polarization ◽  
Strained Layer Superlattice

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 High spin mixing conductance and spin interface transparency at the interface of a Co2Fe0.4Mn0.6Si Heusler alloy and Pt

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Braj Bhusan Singh ◽  
Koustuv Roy ◽  
Pushpendra Gupta ◽  
Takeshi Seki ◽  
Koki Takanashi ◽  
...  
Keyword(s):  
High Spin ◽  
Heusler Alloys ◽  
Hall Voltage ◽  
Spin Pumping ◽  
Magnetic Damping ◽  
Spin Polarized ◽  
Inverse Spin Hall Effect ◽  
Interface Transparency ◽  
Full Heusler ◽  
Full Heusler Alloys

AbstractFerromagnetic materials exhibiting low magnetic damping (α) and moderately high-saturation magnetization are required from the viewpoints of generation, transmission, and detection of spin waves. Since spin-to-charge conversion efficiency is another important parameter, high spin mixing conductance $$({g_{r}^{\uparrow \downarrow}})$$ ( g r ↑ ↓ ) is the key for efficient spin-to-charge conversion. Full Heusler alloys, e.g., Co2Fe0.4Mn0.6Si (CFMS), which are predicted to be 100% spin-polarized, exhibit low α. However, $$g_r^{ \uparrow \downarrow }$$ g r ↑ ↓ at the interface between CFMS and a paramagnet is not fully understood. Here, we report investigations of spin pumping and the inverse spin Hall effect in CFMS/Pt bilayers. Damping analysis indicates the presence of significant spin pumping at the interface of CFMS and Pt, which is also confirmed by the detection of an inverse spin Hall voltage. We show that in CFMS/Pt, $$g_r^{ \uparrow \downarrow }$$ g r ↑ ↓ (1.70 × 1020 m−2) and the interface transparency (83%) are higher than the values reported for other ferromagnetic/heavy metal systems. We observed a spin Hall angle of ~0.026 for the CFMS/Pt bilayer system.

High temperature spin-polarized semiconductivity with zero magnetization in two-dimensional Janus MXenes

2016 ◽  
Vol 4 (27) ◽  
pp. 6500-6509 ◽  
Author(s):  
Junjie He ◽  
Pengbo Lyu ◽  
L. Z. Sun ◽  
Ángel Morales García ◽  
Petr Nachtigall
Keyword(s):  
High Temperature ◽  
Spin Polarization ◽  
High Spin ◽  
Room Temperature ◽  
Magnetic Order ◽  
2D Materials ◽  
Two Dimensional ◽  
Next Generation ◽  
Spin Polarized ◽  
High Spin Polarization

Searching for two-dimensional (2D) materials with room-temperature magnetic order and high spin-polarization is essential for the development of next-generation nanospintronic devices.

Ab initio study of magnetic properties of Fe-Mn-Al Heusler alloys

2013 ◽  
Vol 1581 ◽  
Author(s):  
Vladimir V. Sokolovskiy ◽  
Vasiliy D. Buchelnikov ◽  
Mikhail A. Zagrebin ◽  
Sergey V. Taskaev ◽  
Vladimir V. Khovaylo ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Curie Temperature ◽  
Density Functional ◽  
Heusler Alloys ◽  
Exchange Interactions ◽  
Ferromagnetic Coupling ◽  
Magnetic Exchange ◽  
Functional Theory ◽  
Spin Polarized ◽  
Curie Temperatures

ABSTRACTDensity functional theory (DFT) based on the spin-polarized relativistic Korringa-Kohn-Rostoker (SPR-KKR) method is used to investigate the magnetic properties of nonstoichiometric Fe2+xMn1-xAl Heusler alloys, where 0 ≤ x ≤ 0.9. The composition dependences of the magnetic exchange couplings and the Curie temperature for the cubic L21 phase are obtained. Our simulations have shown that the Fe-Fe nearest neighbors present a strong ferromagnetic coupling. Moreover, these exchange interactions are larger than other interactions. The substitution of Mn by Fe in Fe2+xMn1-xAl (0 ≤ x ≤ 0.9) leads to an increase in the Curie temperature. This tendency and the values of Curie temperatures are in agreement with the experimental results for Fe2+xMn1-xAl (x = 0, and 0.1). The highest Curie temperature was observed for the Fe-richer alloy.

Mn2CrGa-based Heusler alloys with low net moment and high spin polarization

2018 ◽  
Vol 51 (25) ◽  
pp. 255001 ◽  
Author(s):  
Wenyong Zhang ◽  
Yunlong Jin ◽  
Ralph Skomski ◽  
Parashu Kharel ◽  
Xingzhong Li ◽  
...  
Keyword(s):  
Spin Polarization ◽  
High Spin ◽  
Heusler Alloys ◽  
High Spin Polarization

Using an iron overlayer to enhance contrast in SEMPA

1990 ◽  
Vol 48 (4) ◽  
pp. 766-767
Author(s):  
R. Browning ◽  
T. VanZandt ◽  
M. Landolt
Keyword(s):  
Spin Polarization ◽  
High Spin ◽  
Secondary Electron ◽  
Electron Spin Polarization ◽  
Sufficient Information ◽  
Recording Industry ◽  
Secondary Electrons ◽  
Spin Polarized ◽  
Surface Magnetization ◽  
High Spin Polarization

Secondary electron microscopy with polarization analysis (SEMPA), uses the spin polarization of the low energy secondary electrons to image the surface magnetization of a magnetic sample. However, many systems of interest to the magnetic recording industry have a low secondary electron spin polarization. This is because, either the material’s magnetization is low, or because surface treatments have reduced the spin polarization. The low spin polarized contrast from these samples means that detailed study of the characteristics of a recorded field is very time consuming. Typically tens of minutes are needed to collect a single image that may cover a very small part of a sample. As a result, it is difficult to provide sufficient information over the range of length scales needed to characterize the magnetic distribution.One method by which the problem of low spin polarized contrast may be overcome, is to use an overlayer with a high spin polarization. This film must be thin, and magnetically soft to minimize any change in the sample’s magnetization. Pure Fe films appear suitable, and high spin polarized contrast can be observed in nanometer thick fims of Fe.

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