Formability and thermal stability of α′ phase in (Fe1−y Coy)–(B, C, N) films

Sunaga, K.; Kadowaki, Shizuo; Tsunoda, Masakiyo; Takahashi, M.

doi:10.1002/pssb.200304622

Cited by 7 publications

(7 citation statements)

References 8 publications

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“…For instance, Fe 16 N 2 was reported as a tetragonal compound with c/a = 1.1 and K u = 0.45 × 10 6 J·m −3 29 . In FeCo-based alloys, (Fe y Co 1−y )−(B, C, N) (y ≥ 0.7) films with t = 300 nm deposited on MgO substrates have been studied, and a tetragonal structure resembling that of Fe 16 N 2 was detected in the Fe-rich regions 29,30 . The (Fe 0.4 Co 0.6 ) 98 C 2 films with t = 100 nm deposited on AuCu buffer layers were characterised by c/a = 1.03 and K u = 0.44 × 10 6 J·m −3 18,19 .…”

Section: Introductionmentioning

confidence: 99%

Stabilisation of tetragonal FeCo structure with high magnetic anisotropy by the addition of V and N elements

Hasegawa

Niibori

Takemasa

et al. 2019

Sci Rep

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The development of magnetic materials with high saturation magnetization ( M s ) and uniaxial magnetic anisotropy ( K u ) is required for the realisation of high-performance permanent magnets capable of reducing the power consumption of motors and data storage devices. Although FeCo-based materials with the body-centred cubic structure (bcc) exhibit the highest M s values among various transition metal alloys, their low K u magnitudes makes them unsuitable for permanent magnets. Recent first-principles calculations and experimental studies revealed that the epitaxial FeCo thin films with the body-centred tetragonal (bct) structure and thicknesses of several nanometres exhibited K u values of 10 6 J·m −3 due to epitaxial stress, which required further stabilisation. In this work, the FeCo lattice stabilised via VN addition were characterised by high K u magnitudes exceeding 10 6 J·m −3 . The obtained bct structure remained stable even for the films with thicknesses of 100 nm deposited on an amorphous substrate, suggesting its possible use in bulk systems.

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Section: Introductionmentioning

confidence: 99%

Stabilisation of tetragonal FeCo structure with high magnetic anisotropy by the addition of V and N elements

Hasegawa

Niibori

Takemasa

et al. 2019

Sci Rep

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“…To consider the structural stability of the (Fe 0.4 Co 0.6 ) 0.9 V 0. [19,31]. The ΔH value of Fe 16 C indicates that it is formable at low temperatures.…”

Section: Enthalpy Of Formation (δH) Evaluated By Dft Calcul Ations An...mentioning

confidence: 99%

“…MgO substrates [18,19]. They found that the Fe-rich alloys showed a tetragonal structure, which became unstable with an increase in the Co content.…”

Section: Introductionmentioning

confidence: 99%

Uniaxial magnetic anisotropy of tetragonal FeCoV and FeCoVC films

Takahashi¹,

Sakamoto²,

Kumagai³

et al. 2018

J. Phys. D: Appl. Phys.

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The tetragonal crystalline structure and magnetic properties of MgO/Rh/(Fe1−xCox)0.9V0.1 and MgO/Rh/(Fe1−xCox)0.9V0.05C0.05 films (0.4 x 0.7, thickness t = 2–50 nm) were studied. For both the systems, the films with t = 5 nm showed a tetragonal distortion (c/a) of ~1.15 at x = 0.6. Furthermore, in the case of (Fe1−xCox)0.9V0.05C0.05, the films showed a c/a value of ~1.06 even at t = 50 nm. The magnetic anisotropy induced by the tetragonal distortion of films became 1.4 × 107 erg cm−3 for (Fe1−xCox)0.9V0.1 (t = 5 nm) and (Fe1−xCox)0.9V0.05C0.05 (t = 5 nm) films. We also investigated the tetragonal distortion stability of the films using their enthalpy of formation (ΔH) values obtained from density functional theory calculations.

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“…In addition, soft magnetic properties can be induced with the help of C, that is, the measured magnetic properties change from hard to soft in Fe-C-N compounds. [13][14][15][16][17] These results imply that light elements play an important role in tailoring the electronic states of neighboring magnetic elements.…”

Section: Introductionmentioning

confidence: 99%

Antiperovskite Magnetic Materials with 2p Light Elements for Future Practical Applications

Isogami

Takahashi

2022

Adv Elect Materials

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Light elements having 2p electrons such as B, C, and N are common elements that have played an important role in various functional materials. In particular, nitrides have long been used in the development of semiconductors, superconductors, and magnets. More recently, Fe‐ and Mn‐based antiperovskite‐type compounds with light elements have attracted considerable attention in the field of spintronic engineering, because of the development of intriguing and practical applications making them one of the key materials for future devices. In this article, it is first reviewed the evolution of applications and which light elements are employed. Then the representative applications and characteristics of the light elements, including magnetoresistive effects, magnetization switching, current‐spin and thermoelectric conversions, magnetic anisotropy, and domain nucleation are individually highlighted. Additionally, the crystal structure, fundamental properties, and theoretical study are addressed to enable a deeper understanding of the role of light elements in the unit cell. Beyond compounds with N, a demonstration using B and C is discussed to examine their effect on the magnetic structures of antiperovskite compounds. Finally, prospective and future strategies are discussed to build a platform of practical material based on light elements.

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Formability and thermal stability of α′ phase in (Fe_1−y Co_y)–(B, C, N) films

Cited by 7 publications

References 8 publications

Stabilisation of tetragonal FeCo structure with high magnetic anisotropy by the addition of V and N elements

Stabilisation of tetragonal FeCo structure with high magnetic anisotropy by the addition of V and N elements

Uniaxial magnetic anisotropy of tetragonal FeCoV and FeCoVC films

Antiperovskite Magnetic Materials with 2p Light Elements for Future Practical Applications

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