Growth dependent magnetization reversal in Co2MnAl full Heusler alloy thin films

Barwal, Vineet; Husain, Sajid; Behera, Nilamani; Goyat, Ekta; Chaudhary, Sujeet

doi:10.1063/1.5004425

Cited by 18 publications

(2 citation statements)

References 48 publications

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“…included in these tables for comparison, serve as a cross-check for the values of H k obtained from the H r (ϕ H ) data. The reduction in H k with increasing deposition temperature is directly related to the defect density in the multi-domain films [53]. The equilibrium magnetization angle, ϕ M , is plotted against the corresponding field angle ϕ H for all the CFS films in figure 6.…”

Section: Angular Variations Of the Resonance Field And Fmr Line-mentioning

confidence: 99%

Uniaxial anisotropy, intrinsic and extrinsic damping in Co₂FeSi Heusler alloy thin films

Hazra¹,

Kaul²,

Srinath³

et al. 2019

J. Phys. D: Appl. Phys.

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Ferromagnetic resonance (FMR) technique has been used to study the magnetization relaxation processes and magnetic anisotropy in two different series of the Co 2 FeSi (CFS) Heusler alloy thin films, deposited on the Si(111) substrate by ultra high vacuum magnetron sputtering. While the CFS films of fixed (50 nm) thickness, deposited at different substrate temperatures (T S ) ranging from room temperature (RT) to 600 • C, constitute the series-I, the CFS films with thickness t varying from 12 nm to 100 nm and deposited at 550 • C make up the series-II. In series-I, the CFS films deposited at T S = RT and 200 • C are completely amorphous, the one at T S = 300 • C is partially crystalline, and those at T S = 450 • C, 550 • C and 600 • C are completely crystalline with B2 order. By contrast, all the CFS films in series-II are in the fully-developed B2 crystalline state. Irrespective of the strength of disorder and film thickness, angular variation of the resonance field in the film plane unambiguously establishes the presence of global 'in-plane' uniaxial anisotropy. The uniaxial anisotropy field decreases as the crystalline order in the films increases and goes through a minimum at t = 50 nm as a function of film thickness. Landau−Lifshitz−Gilbert damping and two-magnon scattering dominantly contribute to the line-broadening in both 'in-plane' and 'out-of-plane' configurations. The two-magnon scattering has larger magnitude in the amorphous films than in the crystalline ones. Angular variation of the linewidth in the film plane reveals that, in the CFS thin films of varying thickness, a crossover from the 'in-plane' local four-fold symmetry (cubic anisotropy) to local two-fold symmetry (uniaxial anisotropy) occurs as t exceeds 50 nm. Gilbert damping parameter α decreases monotonously from 0.047 to 0.0078 with decreasing disorder strength (increasing T S ) and jumps from 0.008 for the CFS film with t = 50 nm to 0.024 for the film with t = 75 nm. Such variations of α with T S and t are understood in terms of the changes in the total (spin-up and spin-down) density of states at the Fermi level caused by the disorder and film thickness. Spin pumping across the Co 2 FeSi film/Ta cap-layer interface makes negligible contribution to α. We propose that disorder and/or the film thickness can be used as control parameters to tune α, whose value is decisive in choosing a ferromagnetic film for a given spintronics application.

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Section: Angular Variations Of the Resonance Field And Fmr Line-mentioning

confidence: 99%

Uniaxial anisotropy, intrinsic and extrinsic damping in Co₂FeSi Heusler alloy thin films

Hazra¹,

Kaul²,

Srinath³

et al. 2019

J. Phys. D: Appl. Phys.

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“…In several studies in the literature, unusual angulardependent magnetism is always seen in the FeCoB-and MgO-based systems and is always attributed to the uniaxial magnetic anisotropy, which does not follow the standard Stoner-Wohlfarth model [34,36,[62][63][64] of magnetic anisotropy. For example, Kipgen et al observed MA in ionbeam sputtered FeCoB on Si(001) substrate and argued that this MA is strain induced where the crystallographic orientation of the underlying Si(001) substrate played an important role in the anisotropy of the film [35].…”

Section: Discussionmentioning

confidence: 99%

Interface-resolved study of magnetism in MgO/FeCoB/MgO trilayers using x-ray standing wave techniques

et al. 2023

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Interfaces in MgO/FeCoB/MgO trilayer have been studied with grazing incident nuclear resonance scattering using the x-ray standing wave technique. High depth selectivity of the present method allows one to measure magnetism and structure at the two interfaces of FeCoB, namely, FeCoB on MgO and MgO on FeCoB, independently, yielding an intriguing result that both interfaces are not symmetric. A high-density layer with an increased magnetic hyperfine field at the FeCoB-on-MgO interface suggests different growth mechanisms at the two interfaces. The azimuthal angle-dependent magneto-optic Kerr effect measurements reveal the presence of unusual uniaxial magnetic anisotropy (UMA) in the trilayer. An in situ temperature-dependent study discovered that this UMA systematically reduces with temperature. After annealing at 250 • C, the trilayer starts following the standard Stoner-Wohlfarth model for in-plane UMA. The trilayer becomes isotropic at 450 • C with an order-of-magnitude increase in coercivity. The asymmetry at the interfaces is in turn explained by boron diffusion from the FeCoB interface layer into the nearby MgO layer. Stress-induced UMA is observed in the boron-deficient FeCoB layer, superimposed with the bulk FeCoB layer, and found to be responsible for unusual UMA. The temperature-dependent variation in the UMA and coercivity can be understood in terms of variations in the internal stresses and coupling between FeCoB bulk and the interface layer.

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Effect of the growth rate on the structural, magnetic and transport properties of NiFe thin films

Goyat

Pandey

Hait

et al. 2023

J Mater Sci: Mater Electron

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Growth dependent magnetization reversal in Co2MnAl full Heusler alloy thin films

Cited by 18 publications

References 48 publications

Uniaxial anisotropy, intrinsic and extrinsic damping in Co₂FeSi Heusler alloy thin films

Uniaxial anisotropy, intrinsic and extrinsic damping in Co₂FeSi Heusler alloy thin films

Interface-resolved study of magnetism in MgO/FeCoB/MgO trilayers using x-ray standing wave techniques

Effect of the growth rate on the structural, magnetic and transport properties of NiFe thin films

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Growth dependent magnetization reversal in Co2MnAl full Heusler alloy thin films

Cited by 18 publications

References 48 publications

Uniaxial anisotropy, intrinsic and extrinsic damping in Co2FeSi Heusler alloy thin films

Uniaxial anisotropy, intrinsic and extrinsic damping in Co2FeSi Heusler alloy thin films

Interface-resolved study of magnetism in MgO/FeCoB/MgO trilayers using x-ray standing wave techniques

Effect of the growth rate on the structural, magnetic and transport properties of NiFe thin films

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Uniaxial anisotropy, intrinsic and extrinsic damping in Co₂FeSi Heusler alloy thin films

Uniaxial anisotropy, intrinsic and extrinsic damping in Co₂FeSi Heusler alloy thin films