Effect of rapid solidification on the site preference of Heusler alloy Mn<sub>2</sub>NiSb

Luo, Hongzhi; Wu, Zhu; Li, M a; Liu, Guodong; Li, Yangxian; Zhu, Xinxin; Jiang, Chengbao; Xu, Huibin; Wu, Guangheng

doi:10.1088/0022-3727/42/9/095001

Cited by 18 publications

(3 citation statements)

References 21 publications

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“…The latter has been also confirmed by experiments on Mn 2 CoGa and Mn 2 CoSn films as well as Co doped Mn 3 Ga samples, [20][21][22][23] but experiments on Mn 2 NiSb revealed that the actual arrangement of the atoms at the various sites can be influenced by the preparing method. 24 Inverse Heuslers are interesting for applications since they combine coherent growth on semiconductors with large Curie temperatures which can exceed the 1000 K as in the case of Cr 2 CoGa. 25 Slater and Pauling had shown in two pioneering papers that in the case of binary magnetic alloys when we add one valence electron in the compound this occupies spindown states only and the total spin magnetic moment decreases by about 1 µ B .…”

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Generalized Slater-Pauling rule for the inverse Heusler compounds

et al. 2013

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We present extensive first-principles calculations on the inverse full-Heusler compounds having the chemical formula X2YZ where (X = Sc, Ti, V, Cr or Mn), (Z = Al, Si or As) and the Y ranges from Ti to Zn. Several of these alloys are identified to be half-metallic magnets. We show that the appearance of half-metallicity is associated in all cases to a Slater-Pauling behavior of the total spin-magnetic moment. There are three different variants of this rule for the inverse Heusler alloys depending on the chemical type of the constituent transition-metal atoms. Simple arguments regarding the hybridization of the d -orbitals of neighboring atoms can explain these rules. We expect our results to trigger further experimental interest on this type of half-metallic Heusler compounds. PACS numbers: 75.50.Cc, 75.30.Et, 71.15.Mb The rise of nanotechnology and nanoscience during the last decade brought to the center of scientific research new phenomena and materials. Spintronics and magnetoelectronics compose one of the most rapidly expanding field in nanoscience. 1 Half-metallic magnetic compounds play a crucial role in this development. 2 These materials present usual metallic behavior for the one spin direction while an energy gap in the band structure is present in the other spin direction similarly to semiconductors. 3,4 The possibility of creating 100% spin-polarized current has triggered the interest on such compounds. 5 De Groot and collaborators in 1983 have initially suggested based on electronic structure calculations that NiMnSb, a semi-Heusler alloy, is a halfmetal 6 and since then several half-metallic compounds have been discovered. 7 Several aspects concerning the implementation of half-metallic alloys in realistic devices, like tunnelling magnetic junctions or giant magnetoresistive junctions and spin-injectors, have been discussed in literature. [8][9][10] The family of Heusler alloys incorporates more than 1000 members almost all crystalizing in a close-packed cubic structure similar to the binary semiconductors. 11 Most of them are metals exhibiting diverse magnetic phenomena. The lattice is a f.c.c. with four equidistant sites as basis along the diagonal of the unit cell. 3 There are two families of Heusler alloys. The semi-(or half-)Heuslers have the chemical formula XYZ where the sequence of the sites is X-Y-void-Z. The X and Y are transitionmetal elements and Z is a sp-element and the structure is known as the C1 b lattice. The second subfamily consists the full-Heusler compounds with the chemical formula X 2 YZ. When the valence of the X is larger than Y, the atomic sequence is X-Y-X-Z and the structure is the well known L2 1 one with prototype Cu 2 MnAl. 12 When the valence of the Y elements is the largest, the compounds crystallize in the so-called XA structure, where the sequence of the atoms is X-X-Y-Z and the prototype is Hg 2 TiCu. 12 The latter alloys are also known as inverse Heusler compounds. Several inverse Heuslers have been studied using first-principles electronic structure calculat...

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Generalized Slater-Pauling rule for the inverse Heusler compounds

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“…Understanding structural disorder in these materials is important because it can directly impact physical behaviour. 46 For half-Heusler compounds, there are five types of structural disorder that describe the distribution of atomic positions; these disorders are classified as: CaF 2 -type, BiF 3 -type, Cu 2 MnAl-type, CsCl-type, and W-type. 35 Similarly, for the full Heusler compounds, four primary types of structural disorder exist: CsCltype, BiF 3 -type, W-type, and NaTl-type.…”

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confidence: 99%

Challenges in intermetallics: synthesis, structural characterization, and transitions

Macaluso

Greve

2012

Dalton Trans.

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Intermetallics that contain rare-earth elements are particularly interesting because of their temperature- and pressure-dependent structural and physical transitions that make them potential candidates for magnetic applications. This article highlights synthetic routes and structural characterization advancements used to investigate intermetallic materials. Experimental and theoretical examples of three intermetallic structure types--ThCr(2)Si(2), Heusler and Laves--are discussed to present a historical review and to illustrate the grand challenges in unravelling structure-property relationships of intermetallic compounds.

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“…In addition, the complex magnetic structure and related effects, make the study of Heusler alloys useful for fundamental research in the field of magnetism in complex systems. Structural details like atomic site preference and magnetic coordination are important for the properties of Heusler alloys, governing magnetostructural phenomena or causing differences of several degrees in Curie temperatures [5][6].…”

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Structural and Magnetic Properties of Fe Doped Mn-Ga Ribbons

Sarafidis

Gjoka

Kalogirou

et al. 2014

EPJ Web of Conferences

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Abstract. In the present work we study the effect on structural and magnetic properties due to the introduction of Fe in Mn 2 Ga system. Mn 0.7-x Fe x Ga 0.3 (x = 0.1 to 0.3) alloys were prepared with Ar arc-melting as base materials which were subsequently converted to ribbons using melt-spinning technique with velocity ranged from 20 to 35 m/s. Some of the materials were heat treated in a temperature range from 550 to 850 °C and for different time span, from 10 minutes to 1 hour. Alloys were studied by various characterization techniques (EDX, X-ray diffraction, magnetization versus temperature and field). The magnetic properties are improved with the increase of Fe content, Ms rises almost an order of magnitude from 0.05 per formula unit to 0.5 μ B while low temperature coercivity reached 3.5 kOe. The temperature and duration of the thermal processing also plays a significant role. Two phases were detected, the one being stable above 973 K. The materials present two main Curie temperatures, one above 500 K and one transition below room temperature.

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Effect of rapid solidification on the site preference of Heusler alloy Mn₂NiSb

Cited by 18 publications

References 21 publications

Generalized Slater-Pauling rule for the inverse Heusler compounds

Generalized Slater-Pauling rule for the inverse Heusler compounds

Challenges in intermetallics: synthesis, structural characterization, and transitions

Structural and Magnetic Properties of Fe Doped Mn-Ga Ribbons

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Effect of rapid solidification on the site preference of Heusler alloy Mn2NiSb

Cited by 18 publications

References 21 publications

Generalized Slater-Pauling rule for the inverse Heusler compounds

Generalized Slater-Pauling rule for the inverse Heusler compounds

Challenges in intermetallics: synthesis, structural characterization, and transitions

Structural and Magnetic Properties of Fe Doped Mn-Ga Ribbons

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Product

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Effect of rapid solidification on the site preference of Heusler alloy Mn₂NiSb