Large negative magnetoresistance effects in Co2Cr0.6Fe0.4Al

Block, Theresa; Felser, Claudia; Jakob, G.; Ensling, Jürgen; Mühling, Bastian; Gütlich, Philipp; Cava, R. J.

doi:10.1016/j.jssc.2003.07.002

Cited by 215 publications

(151 citation statements)

References 23 publications

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“…1(a). Since the lattice mismatch between CCFA (a CCFA ∼5.737Å [18]) and diagonal length of MgO ( √ 2 × a MgO = 5.954Å) is relatively small (∼ 3%) as shown in Fig. 1(b), it is reasonable to expect that the CCFA films will grow epitaxially with their [100] direction rotated by 45f rom the MgO [100] direction.…”

Section: Methodsmentioning

confidence: 99%

“…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%

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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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Section: Methodsmentioning

confidence: 99%

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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“…CCFA is an interesting candidate due to its high Curie temperature of 760 K 3 and its high value of volume magnetization of ≈3 µ B per formula unit 6,11 at 5 K (the theoretical value is 3.8 µ B per formula unit 12 ). At room temperature, CCFA exhibits a magnetoresistance of 30% for the pure Heusler compound in powder form 13 or 88% if artificial Al 2 O 3 grain boundaries 7 are used. Simple Co 2 Cr 0.…”

Section: Introductionmentioning

confidence: 99%

Magnetic anisotropies and magnetization reversal of the Co2Cr0.6Fe0.4Al Heusler compound

Hamrle

Blomeier

Gaier

et al. 2006

Journal of Applied Physics

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Magnetic anisotropies and magnetization reversal properties of the epitaxial Heusler compound Co 2 Cr 0.6 Fe 0.4 Al (CCFA) deposited on Fe and Cr buffer layers are studied. Both samples exhibit a growth-induced fourfold anisotropy, and magnetization reversal occurs through the formation of stripy domains or 90 • domains. During rotational magnetometric scans the sample deposited on Cr exhibits about 2 • sharp peaks in the angular dependence of the coercive field, which are oriented along the hard axis directions. These peaks are a consequence of the specific domain structure appearing in this particular measurement geometry. A corresponding feature in the sample deposited on Fe is not observed.

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“…Co 2 (CrFe)Al (CCFA) was the first compound for which a high magnetoresistance as a signature for a high spin polarization was found at room temperature. 24,25 The highest tunnel magnetoresistance of more than 2000% was observed in the Heusler compounds Co 2 MnSi with excess of manganese. 26 For the same compound, a high spin polarization was proven directly by spinpolarized photoemission.…”

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confidence: 99%