Large magnetization and high Curie temperature in highly disordered nanoscale Fe2CrAl thin films

Dulal, Rajendra; Dahal, Bishnu; Forbes, Andrew; Pegg, Ian L.; Philip, John

doi:10.1016/j.jmmm.2016.09.130

Cited by 15 publications

(6 citation statements)

References 30 publications

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“…These peaks are also not existed if samples have A2-type disordered structure. Subsequently, the Al atom in the periodic table belongs to a different period than that of Co or Fe, so our samples exhibited an A2 type disordered phase [7].…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 96%

“…The strong exchange interaction is basically due to the Co-Co exchange interactions. As in fully-disordered CFA lattice, the Co atom will have Fe or Al as its nearest neighbor which can lead Co-Al-Co exchange interaction [7]. According to Slater-Pauling (SP) rule, the theoretical bulk saturationmagnetization value for CFA is 5.0 µB/f.u.…”

Section: Effects Of Particle Size On Magnetic Propertiesmentioning

confidence: 99%

“…Full-Heusler alloys may also crystallize in disordered phases like B2 (partially disordered), A2 (fully disordered) and DO3 type phases [4][5][6]. These alloys show multifunctional properties, like half-metallic ferromagnetism (HMF), shape-memory effect, magneto-caloric effect, and thermo-electric behavior [7][8][9][10]. Band-structure calculations divulge that these compounds are half-metallic ferromagnets (HMF), i.e., 100% spin-polarized near Fermi level.…”

Section: Introductionmentioning

confidence: 99%

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Size-dependent structural and magnetic properties of disordered Co2FeAl Heusler alloy nanoparticles

Ahmad

Mitra

Srivastava

et al. 2019

Journal of Magnetism and Magnetic Materials

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Co2FeAl (CFA) nanoparticles (NPs) of different sizes were synthesized by chemical route. The effect of the size of NPs upon the structure and magnetization compared to its bulk counterpart was investigated. The structure and composition were determined from X-ray diffraction (XRD) and electron microscopy. XRD analysis shows that the samples are having single (A2-type) disordered phase. Magnetization measurements suggest that the samples are soft ferromagnetic in nature with very low coercivity. Enhanced magnetic properties like saturation magnetization, coercive force, retentivity, and Curie-temperature are observed with a decrease in particle size. The effect of particle size on hysteresis losses is also discussed. The smallest particles of size 16 nm exhibited the highest saturation magnetization and transition temperature of 180.73 emu/g and 1261 K, respectively. The origin of enhancement in magnetization of Co2FeAl nano-alloy is attributed to the strong Co-Co exchange interaction due to disorder present in the systems.

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Section: X-ray Diffraction (Xrd)mentioning

confidence: 96%

Section: Effects Of Particle Size On Magnetic Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Size-dependent structural and magnetic properties of disordered Co2FeAl Heusler alloy nanoparticles

Ahmad

Mitra

Srivastava

et al. 2019

Journal of Magnetism and Magnetic Materials

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“…This effect can be minimized if the local field of individual flux quanta (Equation (1)) largely exceeds the coercive field of the ferromagnetic layer. In order to reduce the coercivity, thinner ferromagnetic layers could be used [82,83], at the expense of reducing the Curie temperature [84]. Furthermore, optimization of the parameters for imprinting nearly isothermal and stable states, such as the superconducting critical state, imposes different constraints than those needed for imprinting magnetic flux avalanches in superconductors which can substantially heat the material locally and propagate at speeds exceeding those of magnetic domains [85].…”

Section: Discussionmentioning

confidence: 99%

Magnetic Recording of Superconducting States

Shaw

Alvarez

Brisbois

et al. 2019

Metals

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Local polarization of magnetic materials has become a well-known and widely used method for storing binary information. Numerous applications in our daily life such as credit cards, computer hard drives, and the popular magnetic drawing board toy, rely on this principle. In this work, we review the recent advances on the magnetic recording of inhomogeneous magnetic landscapes produced by superconducting films. We summarize the current compelling experimental evidence showing that magnetic recording can be applied for imprinting in a soft magnetic layer the flux trajectory taking place in a superconducting layer at cryogenic temperatures. This approach enables the ex situ observation at room temperature of the imprinted magnetic flux landscape obtained below the critical temperature of the superconducting state. The undeniable appeal of the proposed technique lies in its simplicity and the potential to improve the spatial resolution, possibly down to the scale of a few vortices.

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“…Co 2 TiGe (CTG) thin films were grown using molecular beam epitaxy deposition. The base pressure inside the chamber was below 9 × 10 −10 Torr and less than 5 × 10 −9 Torr during the film deposition 49,50 . Polished silicon (100) substrates were used for the film deposition.…”

Section: Sample Preparationmentioning

confidence: 99%

Weak localization and small anomalous Hall conductivity in ferromagnetic Weyl semimetal Co2TiGe

Dulal

Dahal

Forbes

et al. 2019

Sci Rep

Self Cite

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Several cobalt-based Heusler alloys have been predicted to exhibit Weyl Semimetal behavior due to time reversal symmetry breaking. Co 2 TiGe is one of the predicted ferromagnetic Weyl semimetals. In this work, we report weak localization and small anomalous Hall conductivity in half-metallic Co 2 TiGe thin films grown by molecular beam epitaxy. The longitudinal resistivity shows semimetallic behavior. Elaborate analysis of longitudinal magnetoconductance shows the presence of a weak localization quantum correction present even up to room temperature and reduction in dephasing length at lower temperature. Negative longitudinal magnetoresistance is observed from 5 to 300 K, but at 300 K magnetoresistance becomes positive above 0.5 T magnetic field. The anomalous Hall effect has been investigated in these thin films. The measured anomalous Hall conductivity decreases with increasing temperature, and a small anomalous Hall conductivity has been measured at various temperatures which may be arising due to both intrinsic and extrinsic mechanisms.

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Large magnetization and high Curie temperature in highly disordered nanoscale Fe2CrAl thin films

Cited by 15 publications

References 30 publications

Size-dependent structural and magnetic properties of disordered Co2FeAl Heusler alloy nanoparticles

Size-dependent structural and magnetic properties of disordered Co2FeAl Heusler alloy nanoparticles

Magnetic Recording of Superconducting States

Weak localization and small anomalous Hall conductivity in ferromagnetic Weyl semimetal Co2TiGe

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