Towards a full Heusler alloy showing room temperature half-metallicity at the surface

Cinchetti, Mirko; Wüstenberg, Jan-Peter; Albaneda, M. Sánchez; Steeb, Felix; Conca, A.; Jourdan, Martin; Aeschlimann, Martin

doi:10.1088/0022-3727/40/6/s05

Cited by 30 publications

(21 citation statements)

References 31 publications

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“…4 Al were investigated by SR-PES so far. [13][14][15][16][17] The strong temperature dependence of the TMR of Heusler based MTJs has been related to a temperature-dependent spin polarization in the ferromagnetic electrode via the Jullière formula. Most prominently, the so-called nonquasiparticle states have been invoked.…”

Section: Introductionmentioning

confidence: 99%

Surface spin polarization of the nonstoichiometric Heusler alloy Co2MnSi

et al. 2012

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Using a combined approach of spin-resolved photoemission spectroscopy, band structure and photoemission calculations we investigate the influence of bulk defects and surface states on the spin polarization of nonstoichiometric Co 2 Mn α Si thin films (with α = 0.69 and α = 1.19) with bulk L2 1 order. We find that for Mn-poor alloys the spin polarization at the Fermi energy (E F ) is negative due to the presence of Co Mn antisite and minority surface state contributions. In Mn-rich alloys, the suppression of Co Mn antisites leads to a positive spin polarization at E F , and the influence of minority surface states on the photoelectron spin polarization is reduced.

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Section: Introductionmentioning

confidence: 99%

Surface spin polarization of the nonstoichiometric Heusler alloy Co2MnSi

et al. 2012

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“…The associated upward shift of the Fermi energy (due to electron doping) and the introduction of defect states at the Fermi energy [23] might be the reason for lower TMR ratios as compared to MgO buffered samples [27,36]. For an identical sample we found a surface spin polarization of 45% using SR-PES [37]. The film has a fourfold in-plane magnetic anisotropy [38].…”

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confidence: 76%

Ultrafast magnetization dynamics in the half‐metallic Heusler alloy Co₂Cr_0.6Fe_0.4Al

Wüstenberg

Steil

Alebrand

et al. 2011

Physica Status Solidi (b)

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Ultrafast demagnetization upon excitation with intense laser pulses has been observed for a variety of ferromagnetic materials. In half-metals, long demagnetization times are expected due to the band gap for one spin direction. We have investigated the theoretically half-metallic Heusler alloy Co 2 Cr 0.6 Fe 0.4 Al (CCFA), using the time-resolved magnetooptical Kerr effect. A demagnetization time in the range of typical transition metal ferromagnets with lower spin polarization has been found, while magnetization recovery proceeds on a slower time scale. The results are discussed in the context of recent models and experimental results. We propose that for Heusler alloys the initial stage of recovery could be a better measure for the spin polarization than the demagnetization time. A simple estimate leads to a bulk spin polarization value of 0.86 for CCFA.

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“…The low surface polarizations may be due to compositional or magnetic disorder in the surface layers or to modification of the surface electronic structure. Certainly, Aeschlimann and coworkers have shown that the detailed surface preparation can have a huge impact on the reproducibility and magnitude of the measured polarization [210,211]. Dowben and Skomski have presented arguments for coupling of optical phonon modes with magnons which reduces the magnetization even at low temperature [219].…”

Section: Half-metalsmentioning

confidence: 99%

Spin-Resolved Valence Photoemission

Seddon

2014

Handbook of Spintronics

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Spin-resolved valence photoemission has recently seen a resurgence of interest fostered by exciting results in a range of interesting materials. Reviewed here are the basics of, the instrumentation for, and techniques useful in spin-resolved photoemission, together with illustrative examples of its utilization for materials of general importance and of particular relevance to spintronics applications. The example materials are broadly classified into nonmagnetic and magnetic systems. The former covers Rashba systems and topological insulators. The latter includes thin films, half-metals, adsorbates and induced moments, and, finally, a short section on imaging. The review is not intended to be comprehensive in its coverage but rather to provide an introduction to hardware and techniques together with an overview of selected results and state-of-the-art developments. List of Abbreviations 1DOne

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Towards a full Heusler alloy showing room temperature half-metallicity at the surface

Cited by 30 publications

References 31 publications

Surface spin polarization of the nonstoichiometric Heusler alloy Co2MnSi

Surface spin polarization of the nonstoichiometric Heusler alloy Co2MnSi

Ultrafast magnetization dynamics in the half‐metallic Heusler alloy Co₂Cr_0.6Fe_0.4Al

Spin-Resolved Valence Photoemission

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Towards a full Heusler alloy showing room temperature half-metallicity at the surface

Cited by 30 publications

References 31 publications

Surface spin polarization of the nonstoichiometric Heusler alloy Co2MnSi

Surface spin polarization of the nonstoichiometric Heusler alloy Co2MnSi

Ultrafast magnetization dynamics in the half‐metallic Heusler alloy Co2Cr0.6Fe0.4Al

Spin-Resolved Valence Photoemission

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Ultrafast magnetization dynamics in the half‐metallic Heusler alloy Co₂Cr_0.6Fe_0.4Al