Direct band-gap measurement on epitaxial Co2FeAl0.5Si0.5 Heusler-alloy films

Alhuwaymel, T.F.; Carpenter, Robert; Yu, Chris Nga Tung; Kuerbanjiang, Balati; Abdullah, Ranjdar M.; Lazarov, Vlado K.; El-Gomati, Mohamed; Hirohata, Atsufumi

doi:10.1063/1.4916817

Cited by 5 publications

(2 citation statements)

References 19 publications

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“…Apart from determination of the spin polarisation, it also shows the structural ordering of RuFeCrSi depends on the Fe and Ru content. For 0.1 ≤ x < 1.8, the L 2 1 ordering is confirmed, whilst for x = 1.8, the crystalline structure becomes B 2 [ 200 , 201 ]. The spin polarisation of x = 1.5 and 1.7 is measured to be P = 53 and 52%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Heusler alloys for spintronic devices: review on recent development and future perspectives

Elphick

Frost

Samiepour

et al. 2021

Science and Technology of Advanced Materials

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235

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Heusler alloys are theoretically predicted to become half-metals at room temperature (RT). The advantages of using these alloys are good lattice matching with major substrates, high Curie temperature above RT and intermetallic controllability for spin density of states at the Fermi energy level. The alloys are categorised into half- and full-Heusler alloys depending upon the crystalline structures, each being discussed both experimentally and theoretically. Fundamental properties of ferromagnetic Heusler alloys are described. Both structural and magnetic characterisations on an atomic scale are typically carried out in order to prove the half-metallicity at RT. Atomic ordering in the films is directly observed by X-ray diffraction and is also indirectly probed via the temperature dependence of electrical resistivity. Element specific magnetic moments and spin polarisation of the Heusler alloy films are directly measured using X-ray magnetic circular dichroism and Andreev reflection, respectively. By employing these ferromagnetic alloy films in a spintronic device, efficient spin injection into a non-magnetic material and large magnetoresistance are also discussed. Fundamental properties of antiferromagnetic Heusler alloys are then described. Both structural and magnetic characterisations on an atomic scale are shown. Atomic ordering in the Heusler alloy films is indirectly measured by the temperature dependence of electrical resistivity. Antiferromagnetic configurations are directly imaged by X-ray magnetic linear dichroism and polarised neutron reflection. The applications of the antiferromagnetic Heusler alloy films are also explained. The other non-magnetic Heusler alloys are listed. A brief summary is provided at the end of this review.

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Section: Introductionmentioning

confidence: 99%

Heusler alloys for spintronic devices: review on recent development and future perspectives

Elphick

Frost

Samiepour

et al. 2021

Science and Technology of Advanced Materials

Self Cite

235

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“…However, changes in surface roughness, band gap, saturation magnetization, and Gilbert damping constant etc. are found in the Heusler alloys after thermal treatment [15][16][17][18]. Interdiffusion or phase separation may happen during the annealing at high temperatures, which reduces TMR ratio of MTJs [18,19].…”

Section: Introductionmentioning

confidence: 97%