Structure, magnetic and magnetostrictive properties of as-deposited Fe–Ga thin films

Javed, Anam; Morley, N. A.; Gibbs, M.R.J.

doi:10.1016/j.jmmm.2009.04.039

Cited by 67 publications

(48 citation statements)

References 33 publications

(42 reference statements)

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“…The positive E-ield was referred to be parallel to the prepolarization of the substrate, while the negative E-ield was referred to be antiparallel. The effective saturation magnetostriction constants (λ) were measured using a technique [25,26] based on the Villari effect. Because it is dificult to directly measure λ of the CoFe ilm on the PMN-PT substrate, it was estimated by measuring the same grown CoFe ilm on a Si substrate.…”

Section: Methodsmentioning

confidence: 99%

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Giant electric field tunable magnetic properties in a Co₅₀Fe₅₀/lead magnesium niobate–lead titanate multiferroic heterostructure

Yang¹,

Morley²,

Sharp³

et al. 2015

J. Phys. D: Appl. Phys.

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[13], Fe 3 O 4 /PZN-PT [14], NiFe 2 O 4 /(0 0 1) PMN-PT [15] and Ni/(1 1 0) PMN-PT [16]. Kim et al [17] studied the effects of the thickness and composition of the magnetic Co x Pd 1−x layer on the ME coupling strength. The ME constant (α) increased from 2 × 10 −7 s m −1 to 2.5 × 10 −7 s m −1 as the ilm thickness of Co 0.25 Pd 0.75 decreased from 30 nm to 10 nm. However, for both Co 0.22 Pd 0.0.78 and Co 0.18 Pd 0.0.82 compositions, α for the 10 nm thick magnetic ilm was lower than that for the 20 nm thick magnetic ilm due to the change of perpendicular magnetic anisotropy (PMA) at 10 nm. In addition, for ultrathin magnetic layers (<20 nm), the magnetostriction constant (λ) can be strongly inluenced by the thickness [18] according to the formula λ = λ b + λ i /t, where λ b is the magnetostriction of the bulk, λ i is the interfacial contribution and t is the magnetic layer thickness [19]. However, the effect of varying λ with t on ME coupling was not considered by Kim et al. AbstractCo 50 Fe 50 /(0 1 1)-oriented lead magnesium niobate-lead titanate (PMN-PT) multiferroic (MF) heterostructures were fabricated by RF sputtering magnetic ilms onto PMN-PT substrates. The effect of magnetic layer thickness (30 nm to 100 nm) on the magnetoelectric (ME) coupling in the heterostructures was studied independently, due to the almost constant magnetostriction constant (λ = 40 ± 5 ppm) and similar as-grown magnetic anisotropies for all studied magnetic layer thicknesses. A record high remanence ratio (M r /M s ) tunability of 95% has been demonstrated in the 65 nm Co 50 Fe 50 /PMN-PT heterostructure, corresponding to a large ME constant (α) of 2.5 × 10 −6 s m −1 , when an external electric ield (E-ield) of 9 kV cm −1 was applied. Such an MF heterostructure provides considerable opportunities for E-ield-controlled multifunctional devices.

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Section: Methodsmentioning

confidence: 99%

“…These H eff values were plotted as a function of the inverse band radii (1/R) and then the gradient of each line was determined. Finally, the λ was determined from [25,26] …”

Section: Methodsmentioning

confidence: 99%

Giant electric field tunable magnetic properties in a Co₅₀Fe₅₀/lead magnesium niobate–lead titanate multiferroic heterostructure

Yang¹,

Morley²,

Sharp³

et al. 2015

J. Phys. D: Appl. Phys.

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“…Moreover, few works have been devoted to the investigation of Fe 1Àx Ga x thin films. [12][13][14][15][16] In a previous work, we studied the characteristics of Tb x Fe 1Àx thin films. 17 In this work, we analyze and correlate the structural and magnetic properties of as-grown and annealed [TbFe 2 /Fe 3 Ga] n heterostructures.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the structural and magnetic properties of sputtered TbFe2/Fe3Ga heterostructures

Ranchal

González-Martín

2011

Journal of Applied Physics

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We have analyzed the structural and magnetic properties of as-grown and annealed [TbFe 2 /Fe 3 Ga] n heterostructures grown by sputtering. Evidence of the bcc structure in the Fe 3 Ga layers has been found. The diffraction peak related to this structure shifts to high angles with the annealing temperature. Also, we have observed a change in the microstructure of the Tb-Fe layers when the thickness layer is reduced in the as-grown heterostructures. Moreover, the Tb content is lower than 33% of the TbFe 2 Laves phase and it depends on the layer thickness. The thermal treatments promote the increase of the Tb content, but only in the heterostructures with thick layers. The strong lattice mismatch between the Tb-Fe and Fe-Ga layers seems to prevent a complete Tb diffusion upon the annealing process. Thus, the crystallization of the TbFe 2 Laves phase is inhibited in the heterostructures with thin layers, although our experimental results indicate the presence of potential magnetostrictive TbFeGa alloys.

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“…The H k was taken at the M/M s ¼ 1. The effective saturation magnetostriction constants (k) were measured using a technique 27 based on the Villari effect. Cross-sectional transmission electron microscopy (TEM) specimens were prepared by Focused Ion Beam (FIB) in FEI Quanta 200 3D and observed on both FEI Tecnai T20 and Jeol 2010F operating at 200 kV.…”

Section: Introductionmentioning

confidence: 99%

Electric field-controlled magnetization in bilayered magnetic films for magnetoelectric memory

Yang

Morley

Rainforth

2015

Journal of Applied Physics

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Structure, magnetic and magnetostrictive properties of as-deposited Fe–Ga thin films

Cited by 67 publications

References 33 publications

Giant electric field tunable magnetic properties in a Co₅₀Fe₅₀/lead magnesium niobate–lead titanate multiferroic heterostructure

Giant electric field tunable magnetic properties in a Co₅₀Fe₅₀/lead magnesium niobate–lead titanate multiferroic heterostructure

Investigation on the structural and magnetic properties of sputtered TbFe2/Fe3Ga heterostructures

Electric field-controlled magnetization in bilayered magnetic films for magnetoelectric memory

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Structure, magnetic and magnetostrictive properties of as-deposited Fe–Ga thin films

Cited by 67 publications

References 33 publications

Giant electric field tunable magnetic properties in a Co50Fe50/lead magnesium niobate–lead titanate multiferroic heterostructure

Giant electric field tunable magnetic properties in a Co50Fe50/lead magnesium niobate–lead titanate multiferroic heterostructure

Investigation on the structural and magnetic properties of sputtered TbFe2/Fe3Ga heterostructures

Electric field-controlled magnetization in bilayered magnetic films for magnetoelectric memory

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Giant electric field tunable magnetic properties in a Co₅₀Fe₅₀/lead magnesium niobate–lead titanate multiferroic heterostructure

Giant electric field tunable magnetic properties in a Co₅₀Fe₅₀/lead magnesium niobate–lead titanate multiferroic heterostructure