Unveiling transport properties of Co2MnSi Heusler epitaxial thin films with ultra-low magnetic damping

Melo, Claudia de; Guillemard, Charles; Friedel, Anna M.; Palin, V.; Rojas-Sánchez, J.-C.; Petit-Watelot, Sébastien; Andrieu, S.

doi:10.1016/j.apmt.2021.101174

Cited by 6 publications

(3 citation statements)

References 53 publications

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“…In that paper we controlled the composition of these compounds and thus changed the electronic density at the Fermi energy. In the case of Co 2 MnSi (x = 0), we reported the existence of a spin band gap in the minority band at the Fermi level [19,20]. Based on photoemission and transport measurements, we can infer that the minority spin band gap is around 0.6 eV, in good agreement with theoretical predictions [21].…”

Section: Introductionsupporting

confidence: 82%

Ultrafast demagnetization of Co2MnSi1–xAlx Heusler compounds using terahertz and infrared light

Zhang

Blank²,

Guillemard

et al. 2023

Phys. Rev. B

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We investigate the ultrafast demagnetization in Co 2 MnSi 1-x Al x quaternary Heusler compounds induced by terahertz (THz) and infrared (IR) pulses. Adjusting the alloy's composition allows us to tailor the spin polarization at the Fermi energy from 97% ± 3% (Co 2 MnSi) due to its minority spin gap around 0.6 eV, down to 63% ± 3% (Co 2 MnAl) without a spin gap. Here we experimentally compare the cases of ultrafast demagnetization, when the material is excited with the help of laser pulses with photon energies below and above the minority spin gap, respectively. More particularly, the pump-photon energies were tuned from 1.02 eV (IR) down to 4.1 meV (THz). We found that the ultrafast demagnetization time decreases upon substitution of Si by Al and thus destroys the minority spin gap. Moreover, a decrease of the pump-photon energies in the near-infrared spectral range results in a slight increase of the demagnetization time. Nevertheless, further decrease of the photon energy by a factor of 250 hardly changes the characteristic time of ultrafast demagnetization. Both THz and IR pulses cause very similar ultrafast magnetization dynamics in our Co 2 MnSi 1-x Al x Heusler compounds.

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Section: Introductionsupporting

confidence: 82%

Ultrafast demagnetization of Co2MnSi1–xAlx Heusler compounds using terahertz and infrared light

Zhang

Blank²,

Guillemard

et al. 2023

Phys. Rev. B

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“…Indeed, the suppression of spin-flip processes in half metals promises low damping, [31][32][33] and damping values as low as , 8 Â 10 À4 have been reported in Co 2 FeAl films 34 and Co 2 MnSi films. 35 Magnetization dynamics can be measured with different techniques. One of them is time-resolved magneto-optic Kerr effect (TR-MOKE) microscopy in which magnetic materials are noninvasively perturbed by a short laser pulse, and their dynamic response is analyzed with a second, delayed pulse.…”

Section: Introductionmentioning

confidence: 99%

Magnetization dynamics of a CoFe/Co2MnSi magnetic bilayer structure

Kim

Guo

Yang

et al. 2023

Journal of Applied Physics

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Half-metallic Heusler alloys are receiving significant attention for spintronic applications utilizing magnetic tunnel junctions and requiring large spin polarization. Co2MnSi (CMS) is one of the most promising candidates for this purpose. Here, we report the magnetization dynamics of a thin, epitaxial CMS film in a magnetic CoFe/CMS bilayer structure sputtered on an MgO substrate. The magnetic precession frequency response of the CoFe/CMS bilayer shows a fourfold symmetry with respect to the azimuthal applied field angle, reflecting the crystal symmetry of the CMS layer and not the underlying CoFe film. Moreover, the effective Gilbert damping parameter exhibits inhomogeneous broadening at lower applied magnetic fields. At large fields, however, the azimuthal angle dependence disappears, and the intrinsic Gilbert damping is observed. This study provides insight into the dynamics of a magnetic bilayer structure that forms an integral element in spintronic applications.

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“…It also presents a high saturation magnetization (1.26 T) 12,13 which allows operating with frequencies above the GHz range at remanence and could result in larger frequency band gaps in MC 14,15 . It also presents a high spin polarization (above 90% experimentally) [16][17][18][19][20][21] allowing interesting magnon spintronic devices [22][23][24] . However, to our knowledge, only few magnonics studies 10,11,[25][26][27][28] have been performed up to now with such materials and few Co-based Heusler alloy magnonic crystals exist in the literature 29,30 .…”

Section: Introductionmentioning

confidence: 99%

Influence of Ga+ milling on the spin waves modes in a Co2MnSi Heusler magnonic crystal

Mantion

Biziere

2022

Journal of Applied Physics

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Ferromagnetic resonance experiment was performed to study the magnonic modes of an antidot lattice nanopatterned in a sputtered Co2MnSi Heusler alloy thin film. The magnonic crystal was prepared with a Ga+ focused ion beam, and micromagnetic simulations were used to explain qualitatively and quantitatively the complex experimental spin waves spectrum. We demonstrate the necessity to consider the geometrical imperfections and the modification of the Co2MnSi magnetic parameters induced by the nanofabrication process to describe the evolution of the frequencies and spatial profiles of the principal experimental spin waves modes in the 0–300 mT magnetic field range. In particular, our model suggests that Ga+ milling induces a drastic decrease (between 80% and 90%) in the bulk Co2MnSi magnetic parameters. In addition, simulations reveal the presence of a diversity of localized and extended spin waves modes whose spatial profiles are closely related to the evolution of the magnetic state at equilibrium from a very non-collinear configuration up to a quasi-saturated state.

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Unveiling transport properties of Co2MnSi Heusler epitaxial thin films with ultra-low magnetic damping

Cited by 6 publications

References 53 publications

Ultrafast demagnetization of Co2MnSi1–xAlx Heusler compounds using terahertz and infrared light

Ultrafast demagnetization of Co2MnSi1–xAlx Heusler compounds using terahertz and infrared light

Magnetization dynamics of a CoFe/Co2MnSi magnetic bilayer structure

Influence of Ga+ milling on the spin waves modes in a Co2MnSi Heusler magnonic crystal

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