Polycrystalline Co2Mn-based Heusler thin films with high spin polarization and low magnetic damping

Guillemard, Charles; Petit-Watelot, Sébastien; Rojas-Sánchez, J.-C.; Hohlfeld, J.; Ghanbaja, Jaâfar; Bataille, A. M.; Fèvre, P. Le; Bertran, F.; Andrieu, S.

doi:10.1063/1.5121614

Cited by 34 publications

(19 citation statements)

References 30 publications

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“…The α values summarized in Table 2 agree well with previously reported values for Co 2 MnGa films (α ≈ 2 × 10 −3 ) [42,43]. In that context, the low α values in conjunction with the previously inferred high degree of spin polarization agree well with the correlation of those properties established by Liu et al [65].…”

Section: Broadband Fmrsupporting

confidence: 90%

“…Single crystals and thin films exhibit Berry curvature-driven large anomalous Hall and Nernst effects [ 16 , 34 , 35 , 36 , 37 , 38 , 39 ]. Further, Co 2 MnGa films show negative magnetoresistances [ 40 ] and high spin polarization [ 41 , 42 ], which in turn results in low magnetic damping [ 42 , 43 ]. Interestingly, Pechan et al reported that Co 2 MnGa films grown on different seed layers achieved tunable strain states, which induced remarkably large two-fold and four-fold in-plane (IP) anisotropies [ 44 ].…”

Section: Introductionmentioning

confidence: 99%

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Magnetic and Electronic Properties of Weyl Semimetal Co2MnGa Thin Films

et al. 2021

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Magnetic Weyl semimetals are newly discovered quantum materials with the potential for use in spintronic applications. Of particular interest is the cubic Heusler compound Co2MnGa due to its inherent magnetic and topological properties. This work presents the structural, magnetic and electronic properties of magnetron co-sputtered Co2MnGa thin films, with thicknesses ranging from 10 to 80 nm. Polarized neutron reflectometry confirmed a uniform magnetization through the films. Hard x-ray photoelectron spectroscopy revealed a high degree of spin polarization and localized (itinerant) character of the Mn d (Co d) valence electrons and accompanying magnetic moments. Further, broadband and field orientation-dependent ferromagnetic resonance measurements indicated a relation between the thickness-dependent structural and magnetic properties. The increase of the tensile strain-induced tetragonal distortion in the thinner films was reflected in an increase of the cubic anisotropy term and a decrease of the perpendicular uniaxial term. The lattice distortion led to a reduction of the Gilbert damping parameter and the thickness-dependent film quality affected the inhomogeneous linewidth broadening. These experimental findings will enrich the understanding of the electronic and magnetic properties of magnetic Weyl semimetal thin films.

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Section: Broadband Fmrsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Magnetic and Electronic Properties of Weyl Semimetal Co2MnGa Thin Films

et al. 2021

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“…[51] reports a value of only 55%. The high spin polarization for Co 2 MnSi has been confirmed for MBE-grown films [35] and related to low magnetic damping [21,52].…”

Section: Introductionmentioning

confidence: 75%

“…[30]. Remarkably, the characteristic spin signature even persists in polycrystalline films [45]. Using angle integrating spin-resolved in-situ VUV-photoemission spectroscopy (h= 21.2 eV) on sputtered epitaxial Co2MnSi(100) thin films, we obtained a spin polarization of 93 % at the Fermi energy [29].…”

Section: Introductionmentioning

confidence: 90%

Band structure tuning of Heusler compounds: Spin- and momentum-resolved electronic structure analysis of compounds with different band filling

et al. 2021

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Half-metallic ferromagnetic Heusler compounds represent an important class of materials for spintronic applications. We experimentally observe the dispersion of electronic bands with spin resolution in three representative Heusler compounds (Co 2 MnGa, Co 2 MnSi, and Co 2 Fe 0.4 Mn 0.6 Si). Bulk-sensitive measurements at very low photon energy are complemented by spin-integrated hard x-ray angular resolved photoemission spectroscopy. The dispersion of majority and minority electrons allows us to link exchange splitting and band filling to the number of valence electrons N v . Photoexcitation at hν = 6.05 eV gives access to the spin-polarization texture P(E B , k x , k y ) of the bulk bands covering a (k x , k y ) range of 60% of the Brillouin zone. We find that Co 2 MnSi and Co 2 Fe 0.4 Mn 0.6 Si exhibit minority band gaps of 0.5 and 0.35 eV, i.e., decreasing band gap with increasing N V in contrast to the rigid-band expectation. For Co 2 MnGa, the minority valence state maximum lies at approx. 0.2 eV above E F .

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“…Magnetic damping properties of CFMS and CFGG alloys were reported to have low values of the Gilbert damping parameter — about 10 –3 (Ref. 44 , 57 – 60 ). The importance of a non-Gilbert-damping mechanism in such Heusler materials was studied in the paper 61 , indicating particular importance of the intrinsic two-magnon scattering mechanism.…”

Section: Introductionmentioning

confidence: 99%

Magnetoelastic interactions and magnetic damping in Co2Fe0.4Mn0.6Si and Co2FeGa0.5Ge0.5 Heusler alloys thin films for spintronic applications

Chumak

Pacewicz

Lynnyk

et al. 2021

Sci Rep

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Co2Fe0.4Mn0.6Si (CFMS) and Co2FeGa0.5Ge0.5 (CFGG) Heusler alloys are among the most promising thin film materials for spintronic devices due to a high spin polarization, low magnetic damping and giant/tunneling magnetoresistance ratios. Despite numerous investigations of Heusler alloys magnetic properties performed up to now, magnetoelastic effects in these materials remain not fully understood; due to quite rare studies of correlations between magnetoelastic and other magnetic properties, such as magnetic dissipation or magnetic anisotropy. In this research we have investigated epitaxial CFMS and CFGG Heusler alloys thin films of thickness in the range of 15–50 nm. We have determined the magnetoelastic tensor components and magnetic damping parameters as a function of the magnetic layer thickness. Magnetic damping measurements revealed the existence of non-Gilbert dissipation related contributions, including two-magnon scattering and spin pumping phenomena. Magnetoelastic constant B11 values and the effective magnetic damping parameter αeff values were found to be in the range of − 6 to 30 × 106 erg/cm3 and between 1 and 12 × 10–3, respectively. The values of saturation magnetostriction λS for CFMS Heusler alloy thin films were also obtained using the strain modulated ferromagnetic resonance technique. The correlation between αeff and B11, depending on magnetic layer thickness was determined based on the performed investigations of the above mentioned magnetic properties.

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Polycrystalline Co2Mn-based Heusler thin films with high spin polarization and low magnetic damping

Cited by 34 publications

References 30 publications

Magnetic and Electronic Properties of Weyl Semimetal Co2MnGa Thin Films

Magnetic and Electronic Properties of Weyl Semimetal Co2MnGa Thin Films

Band structure tuning of Heusler compounds: Spin- and momentum-resolved electronic structure analysis of compounds with different band filling

Magnetoelastic interactions and magnetic damping in Co2Fe0.4Mn0.6Si and Co2FeGa0.5Ge0.5 Heusler alloys thin films for spintronic applications

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