Magnetic, structural, and transport properties of thin film and single crystal Co2MnSi

Raphael, Marc P.; Ravel, Bruce; Willard, M. A.; Cheng, Shuo; Das, B. N.; Stroud, Rhonda M.; Bussmann, K.; Claassen, J. H.; Harris, Vincent G.

doi:10.1063/1.1428625

Cited by 111 publications

(53 citation statements)

References 13 publications

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“…For Co 2 MnSi, 5 K ϳ7 ⍀ cm compares favorably with earlier measurements of single-crystal specimens. 16,17 The residual resistivity ratio 293 K / 5 K ϳ3, which is large for Co 2 MnSi, corresponds to a relatively small contribution to the resistivity from lattice defects and other forms of atomic disorder. We point to this residual resistivity ratio as further evidence of a single-crystal structure.…”

Section: Electrical Transport Propertiesmentioning

confidence: 99%

Magnetic, structural, and transport properties of the Heusler alloysCo2MnSiand NiMnSb

et al. 2003

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We report on structural, magnetic, transport, and spin-polarization measurements of the Heusler alloys Co 2 MnSi and NiMnSb. Laue diffraction patterns confirm the single-crystal nature of Co 2 MnSi. Roomtemperature transport measurements show a negative magnetoresistance in NiMnSb. Point-contact Andreev reflection measurements of the spin polarization yield polarization values for Co 2 MnSi and NiMnSb of 56% and 45%, respectively. Temperature dependence of resistivity for Co 2 MnSi reveals a relatively large residual resistivity ratio ( 293 K / 5 K ) typical of single-crystal Heusler alloys. In NiMnSb, resistivity and magnetization as a function of temperature show evidence of a magnetic phase transition near 90 K.

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Section: Electrical Transport Propertiesmentioning

confidence: 99%

Magnetic, structural, and transport properties of the Heusler alloysCo2MnSiand NiMnSb

et al. 2003

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“…Experimentally it is found to be 50-70% because of chemical disorder. [1][2][3] Thus, the half-metallic property plays a decisive role for magneto-electronics and spin-transport phenomena.…”

Section: Introductionmentioning

confidence: 99%

Half-metallic Co-based quaternary Heusler alloys for spintronics: Defect- and pressure-induced transitions and properties

et al. 2016

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Heusler compounds offer potential as spintronic devices due to their spin-polarization and halfmetallicity properties, where electron spin-majority (minority) manifold exhibits states (band gap) at the electronic chemical potential, yielding full spin-polarization in a single manifold. Yet, Heuslers often exhibit intrinsic disorder that degrades its half-metallicity and spin-polarization. Using densityfunctional theory, we analyze the electronic and magnetic properties of equiatomic Heusler (L21) CoMnCrAl and CoFeCrGe alloys for effects of hydrostatic pressure and intrinsic disorder (thermal antisites, binary swaps, and vacancies). Under pressure, CoMnCrAl undergoes a metallic transition, while half-metallicity in CoFeCrGe is retained for a limited range. Antisite disorder between Cr-Al pair in CoMnCrAl alloy is energetically the most favorable, and retain half-metallic character in Crexcess regime. However, Co-deficient samples in both alloys undergo a transition from half-metallic to metallic, with a discontinuity in the saturation magnetization. For binary swaps, configurations that compete with the ground state are identified and show no loss of half-metallicity; however, the minority-spin bandgap and magnetic moments vary depending on the atoms swapped. For single binary swaps, there is a significant energy cost in CoMnCrAl but with no loss of half metallicity. Although a few configurations in CoFeCrGe energetically compete with the ground state, however the minority-spin bandgap and magnetic moments vary depending on the atoms swapped. These informations should help in controlling these potential spintronic materials.PACS numbers: 31.15. 75.50.Cc,

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“…Cobalt-based full-Heusler alloys have been considered potential candidates for showing HMF properties. Their structural and magnetic properties have been intensively investigated experimentally [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] and theoretically [19][20][21][22][23] because they have comparatively high Curie temperatures T C . In particular, Co 2 Cr 1−x Fe x Al (CCFA) is expected to have suitable electro-magnetic properties for injecting a spinpolarized current [16,22].…”

Section: Introductionmentioning

confidence: 99%

Epitaxial growth of Co2Cr0.6Fe0.4Al Heusler alloy thin films on MgO (0 0 1) substrates by magnetron

Matsuda

Kasahara

Marukame

et al. 2006

Journal of Crystal Growth

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We demonstrate that single-crystalline epitaxial films of the Heusler alloy Co 2 Cr 0.6 Fe 0.4 Al (CCFA) featuring excellent surface flatness can be grown on MgO (001) substrates by magnetron sputtering deposition at room temperature and subsequent annealing at high temperatures. X-ray pole figure measurements reveal that the films exhibit the B2-type structure and the [100] direction of the films is rotated by 45˚from the [100] direction of the MgO substrate. Moreover, their Curie temperatures and saturation magnetizations are also improved by annealing. The surface roughness is about 0.2 nm rms according to atomic force microscopy.

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Magnetic, structural, and transport properties of thin film and single crystal Co2MnSi

Cited by 111 publications

References 13 publications

Magnetic, structural, and transport properties of the Heusler alloysCo2MnSiand NiMnSb

Magnetic, structural, and transport properties of the Heusler alloysCo2MnSiand NiMnSb

Half-metallic Co-based quaternary Heusler alloys for spintronics: Defect- and pressure-induced transitions and properties

Epitaxial growth of Co2Cr0.6Fe0.4Al Heusler alloy thin films on MgO (0 0 1) substrates by magnetron

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