Exchange-bias via nanosegregation in novel Fe2−xMn1+xAl (x = −0.25, 0, 0.25) Heusler films

Kurdi, Samer; Ghidini, M.; Divitini, Giorgio; Nair, Bhaskaran; Kuršumović, A.; Tiberto, P.; Dhesi, S. S.; Barber, Z. H.

doi:10.1039/c9na00689c

Cited by 2 publications

(2 citation statements)

References 65 publications

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“…The generation of heat in magnetic systems in presence of time varying magnetic field occurs because of the change in energy density due to magnetic work done that gets dissipated via spin-phonon coupling [3,4]. On the other hand, magnetic Heusler compounds are an exciting class of intermetallic materials that are known to exhibit high spin polarization, high curie temperature and low magnetic damping parameter [5][6][7]. These unique characteristics can be ideal for above room temperature magneto-thermal applications.…”

Section: Introductionmentioning

confidence: 99%

Strain and crystallite size controlled ordering of Heusler nanoparticles having high heating rate for magneto-thermal application

Karim¹,

Panda

Barman

et al. 2022

Nanotechnology

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Heusler compound nanoparticles with good structural ordering need to be investigated as a potential material class for magneto-thermal applications requiring heat generation in presence of an oscillating magnetic field. Here, we report an important finding of a structural parameter related to the product of the strain and the coherent crystallite size, that can be used to efficiently control the structural ordering and the magnetic property of the Heulser compound nanoparticles. The optimization of this product parameter is found to enhance both the structural ordering and magnetic transition temperature in Co2FeSn Heusler nanoparticles. Furthermore, using magnetic hyperthermia measurements we demonstrate the possibility of heat generation using Heusler compound nanoparticles comparable to that of conventional magnetic nanoparticles. This shall lead to the development of Heulser compounds for similar applications.

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Section: Introductionmentioning

confidence: 99%

Strain and crystallite size controlled ordering of Heusler nanoparticles having high heating rate for magneto-thermal application

Karim¹,

Panda

Barman

et al. 2022

Nanotechnology

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“…Half-metallic materials are therefore of great interest for spintronic devices, for example for enhancing the magnetoresistance in both magnetic tunnel junctions [8][9][10][11][12] and current-perpendicular-to-plane (CPP-GMR) devices [13][14][15][16]. Unfortunately, some of the raw elements of the various magnetic layers in available magnetic tunnel junctions and CPP-GMR devices have been identified as critical [17], and therefore it is crucial to investigate alternative materials made from readily available and cheaper elements [18,19].…”

Section: Introductionmentioning

confidence: 99%

Quantitative atomic order characterization of a Mn₂FeAl Heusler epitaxial thin film

Kurdi

Sakuraba

Masuda

et al. 2022

J. Phys. D: Appl. Phys.

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In this work, we investigate the effect of anti-site disorder on the half-metallic properties of a Mn2FeAl Heusler alloy thin film. The film was grown on TiN-buffered MgO 001 substrates via magnetron sputtering. A detailed structural characterization using X-ray diffraction (XRD) and anomalous XRD showed that the film crystallizes in the partially disordered L21 B structure with 33% disorder between the Mn(B) and Al(D) sites. We measure a positive anisotropic magnetoresistance in the film, which is an indication of non-half metallic behaviour. Our X-ray magnetic circular dichroism sum rules analysis shows that Mn carries the magnetic moment in the film, as predicted, with a positive Fe moment. Experimentally determined moments correspond most closely with those found by density functional calculated ones for the L21 B structure with Mn(B) and Al(D) site disorder, matching the experimental structural analysis. We thus attribute the deviation from half-metallic behaviour to the formation of the L21 B structure, which we support by density functional theory calculations. To realize a half-metallic Mn2FeAl film it is important that the inverse Heusler XA structure is stabilized with minimal anti-site atomic disorder.

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Exchange-bias via nanosegregation in novel Fe_2−xMn_1+xAl (x = −0.25, 0, 0.25) Heusler films

Abstract: Exchange-bias has been reported in bulk nanocrystalline Fe2MnAl, but individual thin films of this Heusler alloy have never been studied so far.

Cited by 2 publications

References 65 publications

Strain and crystallite size controlled ordering of Heusler nanoparticles having high heating rate for magneto-thermal application

Strain and crystallite size controlled ordering of Heusler nanoparticles having high heating rate for magneto-thermal application

Quantitative atomic order characterization of a Mn₂FeAl Heusler epitaxial thin film

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Exchange-bias via nanosegregation in novel Fe2−xMn1+xAl (x = −0.25, 0, 0.25) Heusler films

Abstract: Exchange-bias has been reported in bulk nanocrystalline Fe2MnAl, but individual thin films of this Heusler alloy have never been studied so far.

Cited by 2 publications

References 65 publications

Strain and crystallite size controlled ordering of Heusler nanoparticles having high heating rate for magneto-thermal application

Strain and crystallite size controlled ordering of Heusler nanoparticles having high heating rate for magneto-thermal application

Quantitative atomic order characterization of a Mn2FeAl Heusler epitaxial thin film

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Exchange-bias via nanosegregation in novel Fe_2−xMn_1+xAl (x = −0.25, 0, 0.25) Heusler films

Quantitative atomic order characterization of a Mn₂FeAl Heusler epitaxial thin film