Synthesis and physical properties of arc melted NiMnSb

Gardelis, S.; Androulakis, J.; Migiakis, P.; Giapintzakis, J.; Clowes, S. K.; Bugoslavsky, Y.; Branford, W. R.; Miyoshi, Yasuyuki; Cohen, L. F.

doi:10.1063/1.1739293

Cited by 57 publications

(45 citation statements)

References 26 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: 81%

“…[ Gardelis et al [85] and Ritchie et al [86] have measured the magnetic moments of bulk NMS to be (4±0.02) and 4.02 μ B /f.u., respectively. As listed in Table 7.1, the measured magnetic moments of NMS films show some variations between 3.5 and 4 μ B /f.u.…”

Section: Discussionmentioning

confidence: 99%

“…The differences in the measured magnetic moments are due to the sample preparation [90] and resulting atomic disorder [85].…”

Section: Discussionmentioning

confidence: 99%

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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: 81%

Section: Discussionmentioning

confidence: 99%

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New Bandgap Measurement Technique for a Half-Metallic Ferromagnet

et al. 2014

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“…This material is derived from the Pauli paramagnet CeNi 5 9 , by substituting one Ni-site with Mn in the parent compound. Magnetic measurements on CeMnNi 4 show that this material is a soft ferromagnet with a technical saturation at about 4kOe and a coercive field of less than 5…”

mentioning

confidence: 98%

“…In this letter we introduce a new ferromagnetic material, namely, CeMnNi 4 , with a T c~1 40K which exhibits a large degree of transport spin polarization 8 . This material is derived from the Pauli paramagnet CeNi 5 9 , by substituting one Ni-site with Mn in the parent compound.…”

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confidence: 99%

Ce Mn Ni 4 : A soft ferromagnet with a high degree of transport spin polarization

Singh

Sheet

Raychaudhuri

et al. 2006

Applied Physics Letters

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Abstract:In this letter we introduce a new soft ferromagnetic compound, i.e. CeMnNi 4 , which exhibits a large moment (~4.95µ B /Mn) and high degree of spin polarization. The system has a ferromagnetic transition temperature of 148K. Isothermal magnetization measurements at 5K reveal that the material is a soft ferromagnet with a magnetization saturating at about 500Oe and a coercive field of < 5 Oe. We determine the transport spin polarization of this material from Point Contact Andreev Reflection measurements to be 66% thereby making this material potentially important for spintronic applications. 2With the advent of "spintronics", realizing the ability to inject and manipulate spin polarized electrons in metals and semiconductors has gained particular relevance 1 .The basic philosophy behind this emerging area of research is to be able to inject spin polarized electrons and manipulate the spin as well as the charge to realize novel device schemes and to enhance functionality of existing devices. In this context the search for ferromagnets with a high degree of spin polarization, which can be used as source of spin polarized electrons, has gained particular importance. The forerunner in this class of materials 2 is CrO 2 which exhibits a near complete spin polarization (96%) at the Fermi important to note that though the degree of spin polarization is one of the most important criterion for a spin source, several other factors are also crucial to realize efficient spin injection: These include, the Fermi velocity mismatch between the source and the material in which the electrons are injected, the ease to fabricate the material in thin film form, the robustness of the spin polarization against detrimental effects of disorder and the magnetic properties of the material. Since these requirements are expected to be 3 different for different applications, identifying ferromagnets with a large degree of spin polarization is crucial for the progress of spintronics.In this letter we introduce a new ferromagnetic material, namely, CeMnNi 4 , with a T c~1 40K which exhibits a large degree of transport spin polarization 8 . This material is derived from the Pauli paramagnet CeNi 5 9 , by substituting one Ni-site with Mn in the parent compound. Magnetic measurements on CeMnNi 4 show that this material is a soft ferromagnet with a technical saturation at about 4kOe and a coercive field of less than 5Oe. Point Contact Andreev Reflection (PCAR) measurements on this compound reveal that the material has a large degree of transport spin polarization.The alloy CeMnNi 4 was prepared by arc-melting the constituents in several steps.In the first step, stoichiometric amounts of Ce and Ni were melted to form Ce+4Ni alloy.Subsequently, small amounts of Mn (~20mg) is added to the alloy obtained from the previous melt and the alloy is re-melted till until the required amount of Mn is reacted to obtain CeMnNi 4 . In each step the weight of the alloy is monitored and any weight loss due to the volatile Mn is compensated by taking extra ...

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Extended Berry Curvature Tail in Ferromagnetic Weyl Semimetals NiMnSb and PtMnSb

Singh,

García‐Page,

Noky

et al. 2024

Advanced Science

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Heusler compounds belong to a large family of materials and exhibit numerous physical phenomena with promising applications, particularly ferromagnetic Weyl semimetals for their use in spintronics and memory devices. Here, anomalous Hall transport is reported in the room‐temperature ferromagnets NiMnSb (half‐metal with a Curie temperature (TC) of 660 K) and PtMnSb (pseudo half‐metal with a TC of 560 K). They exhibit 4 µB/f.u. magnetic moments and non‐trivial topological states. Moreover, NiMnSb and PtMnSb are the first half‐Heusler ferromagnets to be reported as Weyl semimetals, and they exhibit anomalous Hall conductivity (AHC) due to the extended tail of the Berry curvature in these systems. The experimentally measured AHC values at 2 K are 1.8 × 102 Ω−1 cm−1 for NiMnSb and 2.2 × 103 Ω−1 cm−1 for PtMnSb. The comparatively large value between them can be explained in terms of the spin‐orbit coupling strength. The combined approach of using ab initio calculations and a simple model shows that the Weyl nodes located far from the Fermi energy act as the driving mechanism for the intrinsic AHC. This contribution of topological features at higher energies can be generalized.

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Synthesis and physical properties of arc melted NiMnSb

Cited by 57 publications

References 26 publications

New Bandgap Measurement Technique for a Half-Metallic Ferromagnet

New Bandgap Measurement Technique for a Half-Metallic Ferromagnet

Ce Mn Ni 4 : A soft ferromagnet with a high degree of transport spin polarization

Extended Berry Curvature Tail in Ferromagnetic Weyl Semimetals NiMnSb and PtMnSb

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