Growth of polycrystalline Heusler alloys for spintronic devices

Sagar, James; Yu, Chris Nga Tung; Lari, Leonardo; Hirohata, Atsufumi

doi:10.1088/0022-3727/47/26/265002

Cited by 7 publications

(7 citation statements)

References 15 publications

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“…For calculations within the primitive cell a 17 3 k-point mesh has been used for structural optimization. Quaternary systems and systems with site disorder have been treated in a 16 atomic cubic cell using a k-point mesh of 13 3 . The c/a variation has been performed with the same accuracy but the volume and the shape of the unit cell have been fixed if not stated otherwise.…”

Section: Methodsmentioning

confidence: 99%

“…During the last decades Heusler alloys have been discussed as possible candidates for different magnetic applications, e.g. halfmetallic Co 2 FeSi for spintronics applications [2][3][4] , as rare earth (RE) free permanent magnets 5,6 , or Ni-based actuators 7,8 and magneto-caloric materials 9,10 , because of their magnetic and electronic properties can be quite easily tuned by composition. [11][12][13][14] Depending on the application the key properties are a high spin polarization, a large magneto crystalline anisotropy (MAE), a high Curie temperature or a large magnetic shape memory effect.…”

Section: Introductionmentioning

confidence: 99%

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Ni-based Heusler compounds: How to tune the magnetocrystalline anisotropy

Herper

2018

Phys. Rev. B

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Tailoring and controlling magnetic properties is an important factor for materials design. Here, we present a case study for Ni-based Heusler compounds of the type Ni 2 YZ with Y = Mn, Fe, Co and Z = B, Al, Ga, In, Si, Ge, Sn based on first principles electronic structure calculations.These compounds are interesting since the materials properties can be quite easily tuned by composition and many of them possess a non-cubic ground state being a prerequisite for a finite magnetocrystalline anisotropy (MAE). We discuss systematically the influence of doping at the Y and Z sublattice as well of lattice deformation on the MAE. We show that in case of Ni 2 CoZ the phase stability and the MAE can be improved using quaternary systems with elements from group 13 and 14 on the Z sublattice whereas changing the Y sublattice occupation by adding Fe does not lead to an increase of the MAE. Furthermore, we studied the influence of the lattice ratio on the MAE. Showing that small deviations can lead to a doubling of the MAE as in case of Ni 2 FeGe.Even though we demonstrate this for a limited set of systems the findings may carry over to other related systems. 1 arXiv:1801.08511v1 [cond-mat.mtrl-sci]

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ni-based Heusler compounds: How to tune the magnetocrystalline anisotropy

Herper

2018

Phys. Rev. B

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“…The research on nanostructures is strongly motivated by the observation that points to the fact that the bulk material properties can abruptly change by scaling the material size down to the nanoscale dimension. , This approach may enhance the typical properties of Heusler alloys usually exhibited in the form of bulk and offers the opportunity to incorporate these novel nanoscale materials into the products of industrial technologies, such as in data storage and thermoelectric cooling devices, among many other applications. − …”

Section: Introductionmentioning

confidence: 99%

Intermetallic Co₂FeIn Heusler Alloy Nanowires for Spintronics Applications

Galdun

Vega

Vargová³

et al. 2018

ACS Appl. Nano Mater.

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Cylindrical Co2FeIn Heusler alloy nanowires are synthesized via template-assisted electrochemical deposition into the hexagonally self-ordered nanopores of hard-anodic alumina membranes. The electroplated nanowires, with 180 ±20 nm in diameter and around 14.5 µm in length, exhibit a polycrystalline nature and they are homogenous in composition. High-resolution transmission electron microscopy (HR-TEM), selected area electron diffraction (SAED) and Xray diffraction (XRD) analysis confirmed a cubic A2 disordered phase of the ferromagnetic Heusler compound, with a lattice parameter of a = 5.764 ± 0.001 Å. In addition, these structural characterizations reveal that the Co2FeIn nanowires display a polycrystalline structure with a pronounced {220} texture. The temperature dependent magnetization behavior and anisotropy field distribution calculations display a dominant role of shape, magnetocrystalline and magnetoelastic terms on the effective magnetic anisotropy of Co2FeIn alloyed nanowire arrays. Magneto-optical Kerr effect measurements performed on single freestanding nanowires, after releasing from the hosting alumina templates, confirmed competing behavior between shape and magnetocrystalline anisotropy contributions, which lead to complex magnetization reversal process. This fabrication technique offers a promising and new forward-looking synthesis of novel Heusler nanomaterials for spintronics applications.

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“…This is possibly due to the creation of islands at greater thicknesses, which in turn creates the increased roughness. This is the opposite of the case for silver seed layers where the film quality was improved by the presence of chromium [20]. This is likely due to intermixing being more prevalent between Cr and V than with Ag.…”

Section: Resultsmentioning

confidence: 74%

Perpendicular Anisotropy Controlled by Seed and Capping Layers of Heusler-Alloy Films

Frost

Samiepour

Hirohata

2022

IEEE Trans. Electron Devices

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Half-metallic Heusler alloys typically have in-plane magnetic anisotropy, which can be converted to perpendicular by attaching MgO or heavy metal, e.g., Pt, layers as similarly applied for conventional ferromagnets. Recently we have found body-centered cubic (bcc) seed layers, e.g., V and W, to induce perpendicular anisotropy in Heusler-alloy films above, however, they show small giant magnetoresistive (GMR) ratios in spin-valve structures to date. This is partially because of the large resistivity of the seed layer and the nonmagnetic layer in the spinvalve. In this study, we have systematically investigated nonmagnetic overlayers and have found that a Ag layer best maintains the perpendicular anisotropy. The corresponding GMR devices have then been fabricated and characterized, achieving the GMR ratio of ∼0.03% at room temperature. Such bcc seed layers can offer an alternative method for perpendicularly magnetized GMR junctions for applications.

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Growth of polycrystalline Heusler alloys for spintronic devices

Cited by 7 publications

References 15 publications

Ni-based Heusler compounds: How to tune the magnetocrystalline anisotropy

Ni-based Heusler compounds: How to tune the magnetocrystalline anisotropy

Intermetallic Co₂FeIn Heusler Alloy Nanowires for Spintronics Applications

Perpendicular Anisotropy Controlled by Seed and Capping Layers of Heusler-Alloy Films

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Growth of polycrystalline Heusler alloys for spintronic devices

Cited by 7 publications

References 15 publications

Ni-based Heusler compounds: How to tune the magnetocrystalline anisotropy

Ni-based Heusler compounds: How to tune the magnetocrystalline anisotropy

Intermetallic Co2FeIn Heusler Alloy Nanowires for Spintronics Applications

Perpendicular Anisotropy Controlled by Seed and Capping Layers of Heusler-Alloy Films

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Product

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Intermetallic Co₂FeIn Heusler Alloy Nanowires for Spintronics Applications