Magnetic properties of Co2MnGa Heusler alloy films with different crystalline order

Oksenenko, V. A.; Kulagin, V.A.; Kudryavtsev, Y. V.; Dubowik, J.; Gościańska, I.; Troshchenkov, Yu. N.

doi:10.1016/j.jmmm.2007.02.163

Cited by 8 publications

(3 citation statements)

References 13 publications

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“…(b) 4.93 (RT) ~ 0.05 0.70 3.40 ~ 0.03 poly-bulk [ 125 ] Exp. (b) 5.004 (RT) 0.975 ~ 0.044 L 2 1 -bulk [ 184 ] 1.04 2.44 [ 185 ] Co 2 MnGa Exp. (b) 3.01 0.52 L 2 1 -bulk [ 45 ] Exp.…”

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

252

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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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“…(b) 4.93 (RT) ~ 0.05 0.70 3.40 ~ 0.03 poly-bulk [ 125 ] Exp. (b) 5.004 (RT) 0.975 ~ 0.044 L 2 1 -bulk [ 184 ] 1.04 2.44 [ 185 ] Co 2 MnGa Exp. (b) 3.01 0.52 L 2 1 -bulk [ 45 ] Exp.…”

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

252

View full text Add to dashboard Cite

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“…[18] The (dis)ordering behaviors and their effects on the physical properties of Heusler alloys have been widely studied. [19,20] Compared with the conventional Heusler alloys, all-d-metal Heusler alloys are more easily to form the B2-type or more ordered L2 1 -type Heusler structure, i.e., Ni 50 Mn 50−x Ti x , Fe 2 CrV-Cr 2 FeV, and Co 2 MnTi. [14,21,22] As a new family of Heusler alloys, all-d-metal Heusler alloys bear a great advantage of high toughness, which is more important for practical engineering applications of functional Heusler alloys.…”

Section: Introductionmentioning

confidence: 99%

Formation of quaternary all-d-metal Heusler alloy by Co doping fcc type Ni₂MnV and mechanical grinding induced B2-fcc transformation

Lu¹,

Zhang²,

Wang³

et al. 2023

Chinese Phys. B

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The structure of the all-d-metal alloy Ni50-x Co x Mn25V25 (x = 0-50) was investigated by theoretical and experimental methods. The first-principles calculations indicate that the most stable structure of Ni2MnV alloy is face-centered cubic (fcc) type structure with ferrimagnetic state and the equilibrium lattice constant is 3.60 Å, which is in agreement with the experimental result. It is remarkable that replacing partial Ni with Co can turn the alloy from fcc structure to B2-type Heusler structure as Co content x > 37 by using melting spinning method, implying that the d-d hybridization between Co/Mn elements and low-valent elements V stabilizes the Heusler structure. The Curie temperature T C of all-d-metal Heuser alloy Ni50-x Co x Mn25V25 (x > 37) increases almost linearly with the increase of Co due to that the interaction of Co-Mn is stronger than Ni-Mn. A magnetic transition from ferromagnetic state to weak magnetic state accompanying with grinding stress induced transformation from B2 to the dual-phase of B2 and fcc has been observed in these all-d-metal Heusler alloys. This phase transformation and magnetic change provide a guide to overcome the brittleness and make the all-d-metal Heusler alloy interesting in stress and magnetic driving structural transition.

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“…Many of the ternary Heusler alloys studied previously have displayed transitions from disordered to ordered structures as a function of deposition or annealing temperature [20][21][22] . Complete disorder (classed as A2) results from disorder on the Co, Mn and Si sites.…”

Section: Introductionmentioning

confidence: 99%

Co2MnSi:Pt multilayers for giant spin Seebeck devices

et al. 2017

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The spin Seebeck effect (SSE) has been widely studied as a potential mechanism for energy harvesting. However, the efficiency of such devices, utilizing the spin thermoelectric effect in thin film form, has not yet reached a sufficient value to make them economically viable. It is therefore imperative that advances are made to investigate means by which the thermoelectric signal can be enhanced. Multilayers of Co 2 MnSi and Pt are fabricated and characterized in an attempt to observe enhanced voltages. We report that bilayers of ferromagnetic conductor/normal metal (FM/NM) exhibit a Longitudinal SSE response and that repetitive stacking of such bilayers results in an increased thermoelectric voltage that is highly dependent upon the quality of CMS/Pt and Pt/CMS interfaces.

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Magnetic properties of Co2MnGa Heusler alloy films with different crystalline order

Cited by 8 publications

References 13 publications

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

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

Formation of quaternary all-d-metal Heusler alloy by Co doping fcc type Ni₂MnV and mechanical grinding induced B2-fcc transformation

Co2MnSi:Pt multilayers for giant spin Seebeck devices

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Magnetic properties of Co2MnGa Heusler alloy films with different crystalline order

Cited by 8 publications

References 13 publications

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

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

Formation of quaternary all-d-metal Heusler alloy by Co doping fcc type Ni2MnV and mechanical grinding induced B2-fcc transformation

Co2MnSi:Pt multilayers for giant spin Seebeck devices

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Product

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Formation of quaternary all-d-metal Heusler alloy by Co doping fcc type Ni₂MnV and mechanical grinding induced B2-fcc transformation