Structural and Magnetic Characterization of NiMnSb Half-Heusler Alloy Prepared by Rapid Quenching

Ryba, T.; Vargová, Zuzana; Varga, R.; Iľkovič, Sergej; Reiffers, M.; Hašková, V.; Szabó, P.; Kravčák, J.; Gyepes, Róbert

doi:10.12693/aphyspola.126.206

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…PCAR has been first used by Soulen et al [7] to measure the spin polarisation of NMS, which has been estimated to be (58±2.3)%. Using the same method, P has been measured to be between 35 and 45% [85][86][87] [94]. These values are smaller than the above values but these are in good agreement with P of 50% obtained by photoemission technique [95].…”

Section: Discussionsupporting

confidence: 80%

“…Similar to the band-gap measurements for the CFS and CFAS thin films, the circularly polarised IR light was used, of which energy matched the expected E g of NMS at RT. As expected, the bandgap of NMS was reduced at RT due to the reduction in the saturation magnetisation at finite temperatures [87].…”

Section: Band-gap Measurementssupporting

confidence: 77%

“…The latter measurements show much lower values of P than the expected 100%. The discrepancy between the expected 100% P for bulk non-stoichiometric compositions [87] and the possible reduction in the band-gap to be below 0.5 eV at the surface [93].…”

Section: Discussionmentioning

confidence: 88%

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New Bandgap Measurement Technique for a Half-Metallic Ferromagnet

et al. 2014

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Spintronics is a new and emerging field in nanotechnology, which has been evolving rapidly. It aims to exploit the spin degree of freedom in order to realise advanced electronic devices. With the recent improvement in the storage media devices following to the discovery of giant magnetoresistance effect, it is envisioned that the electronic devices have several advantages over the conventional electronics in respect to the storage capacity, speed and power consumption. One avenue towards next generation spintronic devices is to develop half-metallic ferromagnets (HMFs) with 100% spin polarisation (P) and Curie temperature (T C ) above room temperature (RT). HMFs have unique properties, in which the majority spins have a metallic band structure, whereas the minority spins have a semiconducting band with the Fermi level (E F ) lying within an energy gap. P of HMFs has been predominantly estimated using Julliere's formula in a magnetic tunnel junction (MTJ) or measured by the Andreev reflection (AR) at low temperature. Both methods are very sensitive to the surface/interface spin polarisation.Alternative optical methods such as photoemission have also been employed. However, these methods require a complicated and expensive set-up. Therefore, it is of paramount importance to directly and easily measure the band-gap of HMFs.The main aim of this study is to develop a new technique to directly measure the band-gap (E g ) of HMFs at RT. For that, a simple experimental set-up has been designed This technique allows measuring E g of HMFs at RT for the first time. It can therefore be used to provide simple optimisation of growth conditions.iii

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Section: Discussionsupporting

confidence: 80%

Section: Band-gap Measurementssupporting

confidence: 77%

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New Bandgap Measurement Technique for a Half-Metallic Ferromagnet

et al. 2014

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A Microstructural Study of the InSb〈Ni, Mn〉 alloy

Sanygin,

Pashkova

2023

Russ. J. Inorg. Chem.

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A Microstructural Study of the InSb〈Ni, Mn〉 alloy

Sanygin,

Pashkova

2023

Žurnal neorganičeskoj himii

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The InSb + 1 at % Ni + 1 at % Mn alloy was studied by optical microscopy and scanning electron microscopy. A Heusler phase based on NiMnSb in the form of microinclusions on InSb dislocations was detected. The chemical composition of the microinclusions on dislocation pile-ups ranges from Ni1.1MnSb to Ni1.2MnSb, and that on individual dislocations is close to Ni1.1MnSb. However, the synthesis gives rise to bulk structural defects in the form of micropores and to elastic deformations around them, which are the main obstacles to the creation of a coherent material with unhindered movement of polarized electrons throughout the volume.

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Structural and Magnetic Characterization of NiMnSb Half-Heusler Alloy Prepared by Rapid Quenching

Cited by 3 publications

References 7 publications

New Bandgap Measurement Technique for a Half-Metallic Ferromagnet

New Bandgap Measurement Technique for a Half-Metallic Ferromagnet

A Microstructural Study of the InSb〈Ni, Mn〉 alloy

A Microstructural Study of the InSb〈Ni, Mn〉 alloy

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