Structure and properties of CoMnSb in the context of half-metallic ferromagnetism

Ksenofontov, Vadim; Melnyk, G.; Wójcik, Marek J.; Wurmehl, S.; Kroth, K.; Reiman, S.; Blaha, Peter; Felser, Claudia

doi:10.1103/physrevb.74.134426

Cited by 62 publications

(54 citation statements)

References 19 publications

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“…Even for crystal structures for which the half-metallicity disappears magnetic mo- o , the magnetic field was ± 0.2T and applied parallel to the incident x-ray beam. ment ratios have been calculated which fit much better to our experimental result than the results for the ideal C1 b structure 9 , namely +8.3% for a disordered L2 1 structure 13 and 15.8% for an alternation of Co 2 MnSb and MnSb structural units 14 , which is closest to our experimental value of m Co spin /m Mn spin =16.7% measured at BL 6.3.1 for sample I. Therefore our XMCD results suggest, that even the nearly stochiometric Co-Mn-Sb films (sample I) are crystallized in a non-ideal structure and not in the ideal C1 b structure, which would be the preferred phase regarding the predicted electronic properties.…”

Section: 1%)supporting

confidence: 63%

“…Again a ferromagnetic coupling of Mn (3.60μ B ) and Co (0.30μ B ) was derived, but half-metallicity disappeared in this case. Very recently, Ksenofontov et al 14 used NMR and Mössbauer spectroscopy to study bulk CoMnSb, they assigned it to the space group F m3m and proposed that the CoMnSb structure can be presented as an alternation of Co 2 MnSb and MnSb structural units with a Co moment of 0.55μ B and a mean Mn moment of 3.48μ B . Again, half-metallicity is not predicted for this structure type.…”

Section: Introductionmentioning

confidence: 99%

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Element-specific study of the temperature dependent magnetization of Co–Mn–Sb thin films

Schmalhorst

Ebke

Meinert

et al. 2009

Journal of Applied Physics

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Magnetron sputtered thin Co-Mn-Sb films were investigated with respect to their element-specific magnetic properties. Stochiometric Co1Mn1Sb1 crystallized in the C1 b structure has been predicted to be half-metallic and is therefore of interest for spintronics applications. It should show a characteristic antiferromagnetic coupling of the Mn and Co magnetic moments and a transition temperature TC of about 480K. Although the observed transition temperature of our 20nm thick Co32.4Mn33.7Sb33.8, Co37.7Mn34.1Sb28.2 and Co43.2Mn32.6Sb24.2 films is in quite good agreement with the expected value, we found a ferromagnetic coupling of the Mn and Co magnetic moments which indicates that the films do not crystallize in the C1 b structure and are probably not fully spin-polarized. The ratio of the Co and Mn moments does not change up to the transition temperature and the temperature dependence of the magnetic moments can be well described by the mean field theory.

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Section: 1%)supporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Element-specific study of the temperature dependent magnetization of Co–Mn–Sb thin films

Schmalhorst

Ebke

Meinert

et al. 2009

Journal of Applied Physics

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“…For nearly stoichiometric films the Co to Mn spin moment ratio was +18.8% after annealing and the unit cell parameter was 11.77Å. This fits the expectations for CoMnSb crystallized in a complex Co 2 MnSb/MnSb super structure as reported by Ksenofontov et al 25 . The addition of Co as well as interdiffusion from the vanadium buffer destroy the super structure.…”

Section: Discussionsupporting

confidence: 89%

“…Similar patterns were found by Ksenofontov et al 25 in powders of Co-Mn-Sb. The peaks can not be indexed based on a L2 1 /C1 b structure with a lattice constant of about 5.9Å.…”

Section: Crystal Structure: X-ray Diffraction (Xrd)supporting

confidence: 89%

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Structural and magnetic properties of Co–Mn–Sb thin films

Meinert

Schmalhorst

Ebke

et al. 2010

Journal of Applied Physics

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Thin Co-Mn-Sb films of different compositions were investigated and utilized as electrodes in alumina based magnetic tunnel junctions with CoFe counter electrode. The preparation conditions were optimized with respect to magnetic and structural properties. The Co-Mn-Sb/Al-O interface was analyzed by X-ray absorption spectroscopy and magnetic circular dichroism with particular focus on the element-specific magnetic moments. Co-Mn-Sb crystallizes in different complex cubic structures depending on its composition. The magnetic moments of Co and Mn are ferromagnetically coupled in all cases. A tunnel magneto resistance ratio of up to 24% at 13 K was found and indicates that Co-Mn-Sb is not a ferromagnetic half-metal. These results are compared to recent works on the structure and predictions of the electronic properties.

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Sorting Stable versus Unstable Hypothetical Compounds: The Case of Multi‐Functional ABX Half‐Heusler Filled Tetrahedral Structures

Zhang

Zakutayev

et al. 2012

Adv Funct Materials

122

140

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Electronic structure theory has recently been used to propose hypothetical compounds in presumed crystal structures, seeking new useful functional materials. In some cases, such hypothetical materials are metastable, albeit with technologically useful long lifetimes. Yet, in other cases, suggested hypothetical compounds may be significantly higher in energy than their lowest‐energy crystal structures or competing phases, making their synthesis and eventual device‐stability questionable. By way of example, the focus here is on the family of 1:1:1 compounds ABX called “filled tetrahedral structure” (sometimes called Half‐Heusler) in the four groups with octet electron count: I‐I‐VI (e.g., CuAgSe), I‐II‐V (e.g., AgMgAs), I‐III‐IV (e.g., LiAlSi), and II‐II‐IV (e.g., CaZnSn). First‐principles thermodynamics is used to sort the lowest‐energy structure and the thermodynamic stability of the 488 unreported hypothetical ABX compounds, many of which were previously proposed to be useful technologically. It is found that as many as 235 of the 488 are unstable with respect to decomposition (hence, are unlikely to be viable technologically), whereas other 235 of the unreported compounds are predicted to be thermodynamically stable (hence, potentially interesting new materials). 18 additional materials are too close to determine. The electronic structures of these predicted stable compounds are evaluated, seeking potential new material functionalities.

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Structure and properties of CoMnSb in the context of half-metallic ferromagnetism

Cited by 62 publications

References 19 publications

Element-specific study of the temperature dependent magnetization of Co–Mn–Sb thin films

Element-specific study of the temperature dependent magnetization of Co–Mn–Sb thin films

Structural and magnetic properties of Co–Mn–Sb thin films

Sorting Stable versus Unstable Hypothetical Compounds: The Case of Multi‐Functional ABX Half‐Heusler Filled Tetrahedral Structures

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