Magnetic and magneto-optical properties of heusler alloys based on aluminium and gallium

Buschow, K.H.J.; Engen, P.G. van

doi:10.1016/0304-8853(81)90151-7

Cited by 402 publications

(203 citation statements)

References 20 publications

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“…[6,12,19,25,26] On the other hand, atom substitution in binary alloys can drastically increase the transition temperature to enlarge the range of the Heusler phase, specifically, in binary Fe 3 Al with BiF 3 -type structure and/or in ternary MnCu 2 Al-type by substitution of Al by Si [27] or of Fe by M (M = Ti, [4,16] V, Cr, Mn, and Mo [26,28] ), respectively. For the ternary alloys, TiFe 2 Al and TiNi 2 Al, past efforts focused on physical properties, [3,8,11,12,[29][30][31] lattice parameters, [6,19,[32][33][34][35][36][37][38][39][40] and structure evaluations. [36] However, no investigation is known dealing with detailed atomic site preference in the Heusler phase of the quaternary system Ti-Fe-Ni-Al.…”

Section: Introductionmentioning

confidence: 99%

The Heusler Phase Ti25(Fe50 − x Ni x )Al25 (0 ≤ x ≤ 50); Structure and Constitution

Yan

Grytsiv

Rogl

et al. 2008

J Phs Eqil and Diff

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Alloys with composition Ti 25 (Fe 50 2 x Ni x )Al 25 (0 £ x £ 50) were investigated employing electron probe microanalysis (EPMA) and X-ray powder diffraction (XPD). For TiFe 2 Al, in situ neutron powder diffraction (ND) was used for the inspection of phase constitution covering the temperature range from 27°C (300 K) to 1277°C (1550 K). Combined Rietveld refinement of ND and XPD data for TiFe 2 Al revealed that Fe atoms occupy the 8c site in space group Fm " 3m; Ti with a small amount of Al sharing the 4a site, and the remaining Ti and Al atoms adopting the 4b site. This structural model was successfully applied in the refinement of all alloys Ti 25 (Fe 50 2 x Ni x )Al 25 (0 £ x £ 50). Partial atom order exists on the Fe-rich side while complete order is observed for the Ni-rich side. Profiles recorded by in situ neutron powder diffraction for TiFe 2 Al in the range of investigated temperatures show two phases, namely Heusler phase and MgZn 2 -type Laves phase. Diffraction peaks from the Heusler phase dominate the profiles at lower temperatures but at higher temperatures the MgZn 2 -type Laves phase is the main phase. No CsCl-type phase was found in the alloy in the investigated temperature range. The thermal expansion coefficient of TiFe 2 Al is 1.4552310 25 K 21 .

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Section: Introductionmentioning

confidence: 99%

The Heusler Phase Ti25(Fe50 − x Ni x )Al25 (0 ≤ x ≤ 50); Structure and Constitution

Yan

Grytsiv

Rogl

et al. 2008

J Phs Eqil and Diff

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“…As it can be seen, close values are observed for the lattice parameters of the ordered L2 1 phase in all the studied alloys, in spite of the smaller atomic radius of the Co atom as compared to those of both Al and Mn atoms. For Co 2 MnAl, reported values yield a = 5.754Å [10] and 5.749Å [9]. With the decrease of the Mn concentration down to about half of the stoichiometry the observed variation of the lattice parameter is < 0.3 %.…”

Section: Resultsmentioning

confidence: 89%

“…Since any paramagnetic or antiferromagnetic contribu-300 400 500 600 700 800 900 tion can be ruled out in this case this feature is then associated to the L2 1 phase, by considering that the relative amount of the ordered phase is overwhelming in this alloy, as indicated from the X-ray analysis. The reported saturation magnetization M s at 300 K of Co 2 MnAl is 104 emu/g [9]. 1.10 the Al concentration decreases and the Mn concentration increases.…”

Section: Resultsmentioning

confidence: 94%

“…Moreover, it has been reported that the L2 1 phase becomes stable only for x > 0.7, where no halfmetallic behavior is present. In the earlier studies on the Heusler Co 2 MnAl alloy in order to stabilize the L2 1 structure was used an annealing of 72 h at 1073 K with a subsequent quenching in water [9,10]. Reported lattice parameters of the ordered L2 1 phase are a = 5.754Å [13] and a = 5.749Å [9]; the Curie temperature is 693 K [9].…”

Section: Introductionmentioning

confidence: 99%

“…In the earlier studies on the Heusler Co 2 MnAl alloy in order to stabilize the L2 1 structure was used an annealing of 72 h at 1073 K with a subsequent quenching in water [9,10]. Reported lattice parameters of the ordered L2 1 phase are a = 5.754Å [13] and a = 5.749Å [9]; the Curie temperature is 693 K [9]. From electronic structure calculations magnetic moments of 0.745µ B and 2.599µ B have been obtained for Co and Mn atoms, respectively [4].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Structural and magnetic properties of the half-ferromagnetic Co2+x+yMn1-xAl1-y alloys

Paduani¹,

Migliavacca²,

Krause³

et al. 2007

Braz. J. Phys.

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Co 2+x+y Mn 1−x Al 1−y intermetallic compounds have been prepared by arc melting and studied with X-ray diffraction and magnetization measurements to ascertain the effect of deviations of composition from the stoichiometry on the ferromagnetism of this system. Hysteresis loops registered at room temperature show a soft ferromagnetic behavior in excess Co. In off-stoichiometric alloys the saturation magnetization is lower than in Co 2 MnAl, whereas the Curie temperature T C is higher in all the studied alloys. T C varies substantially with variations in composition and increases with the Mn content. In the source of this behavior a volume effect is inferred which is expected to lead to strengthened ferromagnetic exchanges.

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Heusler Alloys

Groot¹

2007

Handbook of Magnetism and Advanced Magnetic Materials

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Half‐metallic magnetism was discovered first in a Heusler C1b alloy. Since there is no simple univocal experiment to test for half‐metallicity, electronic structure calculations have played an important role in the discovery, explanation and prediction of half‐metals. Experimental work related to half‐metallicity is reviewed. Attention is given to the special role of surfaces and interfaces. Half‐metallic anti‐ferromagnetism (100% spin‐polarization without a magnetization) is discussed. Finally, the computational and experimental status of heusler L21 alloys is summarized.

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Magnetic and magneto-optical properties of heusler alloys based on aluminium and gallium

Cited by 402 publications

References 20 publications

The Heusler Phase Ti25(Fe50 − x Ni x )Al25 (0 ≤ x ≤ 50); Structure and Constitution

The Heusler Phase Ti25(Fe50 − x Ni x )Al25 (0 ≤ x ≤ 50); Structure and Constitution

Structural and magnetic properties of the half-ferromagnetic Co2+x+yMn1-xAl1-y alloys

Heusler Alloys

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