Exploring Co2MnAl Heusler compound for anomalous Hall effect sensors

Vidal, E. Vilanova; Stryganyuk, G.; Schneider, H.; Felser, Claudia; Jakob, G.

doi:10.1063/1.3644157

Cited by 69 publications

(21 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The anomalous Hall conductivity (σ xy0 ) value is defined as the difference in σ xy values at zero and the saturation fields. It is found that σ xy0 attains a value of 162 S/cm, which is higher than that observed in Mn 2 CoAl (22 S/cm) [2], but less than that of the half-metallic Co 2 FeSi (200 S/cm at 300 K) [25], and Co 2 MnAl (2000 S/cm) [26]. As can be seen from the inset of Fig.…”

Section: Electrical Conductivity and Hall Measurementsmentioning

confidence: 67%

Spin gapless semiconducting behavior in equiatomic quaternary CoFeMnSi Heusler alloy

et al. 2015

View full text Add to dashboard Cite

In this paper, we report the signature of spin gapless semiconductor (SGS) in CoFeMnSi that belongs to the Heusler family. SGS is a new class of magnetic semiconductors which have a band gap for one spin subband and zero band gap for the other, and thus are useful for tunable spin transport based applications. We show various experimental evidences for SGS behavior in CoFeMnSi by carefully carrying out the transport and spin-polarization measurements. SGS behavior is also confirmed by first-principles band-structure calculations. The most stable configuration obtained by the theoretical calculation is verified by experiment. The alloy is found to crystallize in the cubic Heusler structure (LiMgPdSn type) with some amount of disorder and has a saturation magnetization of 3.7 μ B /f.u. and Curie temperature of ∼620 K. The saturation magnetization is found to follow the Slater-Pauling behavior, one of the prerequisites for SGS. Nearly-temperature-independent carrier concentration and electrical conductivity are observed from 5 to 300 K. An anomalous Hall coefficient of 162 S/cm is obtained at 5 K. Point contact Andreev reflection data have yielded the current spin-polarization value of 0.64, which is found to be robust against the structural disorder. All these properties strongly suggest SGS nature of the alloy, which is quite promising for the spintronic applications such as spin injection as it can bridge the gap between the contrasting behaviors of half-metallic ferromagnets and semiconductors.

show abstract

Section: Electrical Conductivity and Hall Measurementsmentioning

confidence: 67%

Spin gapless semiconducting behavior in equiatomic quaternary CoFeMnSi Heusler alloy

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Table 2 shows that the calculated σ A x y and σ S x y are large for Co 2 MnAl, Co 2 MnGa and Co 2 MnIn, but are five to ten times smaller for the other compounds. This suggests that Co 2 MnAl, Co 2 MnGa and Co 2 MnIn may find applications in, e.g., magnetic sensors [26]. Interestingly, the calculated σ S…”

Section: Anomalous and Spin Hall Conductivitiesmentioning

confidence: 82%

“…Therefore, the principal purpose of this work is to understand the AHE in Co-based full Heusler compounds, especially those of half-metallic ones. The results may also help experimentally search for the Heusler compounds with a large AHE for applications, e.g., in magnetization sensors [26].…”

Section: Introductionmentioning

confidence: 96%

High spin polarization of the anomalous Hall current in Co-based Heusler compounds

Tung

Guo

2013

New J. Phys.

View full text Add to dashboard Cite

Based on first principles density functional calculations of the intrinsic anomalous and spin Hall conductivities, we predict that the charge Hall current in Co-based full Heusler compounds Co 2 XZ (X = Cr and Mn; Z = Al, Si, Ga, Ge, In and Sn), except Co 2 CrGa, would be almost fully spin polarized, even though Co 2 MnAl, Co 2 MnGa, Co 2 MnIn and Co 2 MnSn do not have a halfmetallic band structure. Furthermore, the ratio of the associated spin current to the charge Hall current is slightly larger than 1.0. This suggests that these Co-based Heusler compounds, especially Co 2 MnAl, Co 2 MnGa and Co 2 MnIn which are found to have large anomalous and spin Hall conductivities, might be called anomalous Hall half-metals and could have valuable applications in spintronics such as spin valves as well as magnetoresistive and spin-torquedriven nanodevices. These interesting findings are discussed in terms of the calculated electronic band structures, magnetic moments and also anomalous and spin Hall conductivities as a function of the Fermi level.

show abstract

“…5 The compound Co 2 MnAl (x ¼ 1) has not been predicted to be fully spin-polarized; however, its high Curie temperature of $700 K, 3,6 combined with its large anomalous Hall effect (AHE), 7 has redeemed it as a valuable material for Hall effect sensors in automotive applications. 8 In light of the above mentioned potential applications of the full-stoichiometric compounds, it is worthwhile to investigate the physical properties of Co 2 MnSi 1-x Al x as a function of Al content. The dependence of the magnetic and structural properties of Co 2 MnSi 1-x Al x on Al content has been previously investigated.…”

mentioning

confidence: 99%