Atomic disorder effects on half-metallicity of the full-Heusler alloys<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Co</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cr</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow

Miura, Yoshio; Nagao, Keiko; Shirai, Masamitsu

doi:10.1103/physrevb.69.144413

Cited by 562 publications

(332 citation statements)

References 38 publications

Supporting

Mentioning

305

Contrasting

Unclassified

Order By: Relevance

“…6 Off-stoichiometry of the Heusler alloys is also expected to profoundly influence the half-metallic ferromagnetism and hence the TMR characteristic. The effect of defects in the Heusler alloys Co 2 Y Z introduced by off-stoichiometry on the spin-dependent electronic structure has been investigated theoretically [7][8][9][10][11][12] as well as experimentally. [13][14][15] Picozzi et al 7 have predicted from a first-principles calculation that halfmetallicity in Co 2 MnSi and Co 2 MnGe is lost by Co Mn antisites through the appearance of minority-spin in-gap states around E F , while half-metallicity is robustly retained by Mn Co antisites.…”

Section: Introductionmentioning

confidence: 99%

Effects of off-stoichiometry on the spin polarization at the Co2MnβGe0.38/MgO interfa

et al. 2012

View full text Add to dashboard Cite

We have studied the electronic and magnetic states of Mn and Co atoms at the Co 2 Mn β Ge 0.38 (CMG)/MgO (β = 0.67-1.8) interfaces, which constitute CMG/MgO/CMG magnetic tunnel junctions, by means of x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroisms (XMCDs) at the Mn and Co L 2,3 edges and compared the deduced Co and Mn magnetic moments by the density-functional calculations with the coherent potential approximation (CPA). As the Mn content β increased, the intensity of Mn L 2,3 XMCD decreased, in agreement with the result of the CPA calculation, which showed the resultant reduction of charges and spin moment on Mn atoms because of the delocalization of Mn 3d electrons with increasing β. The Co spin magnetic moment for all the samples increased with decreasing β, again consistent with the present calculation and the previous density-functional calculation by Picozzi et al. that the Co Mn antisite has a larger magnetic moment than that of Co atoms at the regular sites and reduces the spin polarization at the Fermi level and hence the tunnel magnetoresistance ratio.

show abstract

Section: Introductionmentioning

confidence: 99%

Effects of off-stoichiometry on the spin polarization at the Co2MnβGe0.38/MgO interfa

et al. 2012

View full text Add to dashboard Cite

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

“…The energy gap around the Fermi level of Co-based full-Heusler alloys in the ordered L2 1 structure is mainly constructed by the states based on the second nearest Co-Co hybridization [13]. So the half-metallic property of the B2 structure is still preserved due to the ordering of the Co-sub-lattice as well as Co 2 CrAl [6]. The magnetic moment in the L2 1 and B2 structure become close to 5.0 µ B , which reflects the feature of half-metals having integer magnetic moment.…”

Section: Resultsmentioning

confidence: 99%

“…The half-metallic property of Heusler alloys, however, is considered to be quite sensitive to their atomic configuration and composition [5,6]. It is pointed out that if there is some lattice defections in crystal, the half-metallic property is possibly broken.…”

Section: Introductionmentioning

confidence: 99%

First-principles study for electronic structure and physical property of Co-based Heusler alloys

Kota

Sakuma

2011

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Abstract.The statistical investigation of the physical property of Co-based Heusler alloys with the atomic composition or configuration dependence are carried out in first-principles approach. In particular, the electronic structure, magnetic moment and electrical resistivity due to disorder alloy effects of Co2MnAl1−zSiz (0.0 < z < 1.0) and Co2Mn1−yFeySi (0.0 < y < 1.0) with the L21, B2 and A2 structure are calculated by using the tight-binding linear muffin-tin orbital method combined with the coherent potential approximation based on the local spindensity functional approximation and by using the Kubo-Greenwood formula, respectively. The obtained results indicate that these properties of the Co-based Heusler alloys significantly depend on the atomic configuration and composition, especially, they are sensitive to the existence of the half-metallic property.

show abstract

Atomic disorder effects on half-metallicity of the full-Heusler alloysCo2(Cr1−x

Cited by 562 publications

References 38 publications

Effects of off-stoichiometry on the spin polarization at the Co2MnβGe0.38/MgO interfa

Effects of off-stoichiometry on the spin polarization at the Co2MnβGe0.38/MgO interfa

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

First-principles study for electronic structure and physical property of Co-based Heusler alloys

Contact Info

Product

Resources

About