Voltage-induced modification in magnetic coercivity of patterned Co50Fe50 thin film on piezoelectric substrate

Moutis, N.; Suarez-Sandoval, D.; Niarchos, D.

doi:10.1016/j.jmmm.2007.10.018

Cited by 21 publications

(12 citation statements)

References 22 publications

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“…ΔH c achieves a maximum of 17.5 kA m −1 (220 Oe) at the E-ield of 7 kV cm −1 in the 45 nm thick sample, which is ive times larger than the H c of 3.5 kA m −1 (44 Oe) without E-ield. The value of ΔH c is also much larger than the 3.5 Oe and 22.93 Oe reported previously in the CoFe/PZT system [30] and CoFeB/SiO 2 /PMN-PT system [31], respectively. The ME coupling constant α can be deined as α = μ 0 ΔM r /E, where μ 0 is the permeability of free space [32].…”

Section: Resultscontrasting

confidence: 61%

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: Resultscontrasting

confidence: 61%

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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“…Recently, the converse ME effect has been reported in some bulk ME composites. [62][63][64][65][66][67][68][69][70] Of interest, a class of electrostatically tunable inductors made of ME composite cores of Metglas/PZT/Metglas have been proposed. By applying electric fi elds, the permeability and anisotropy of metglas changes due to the strong converse ME coupling, thus tuning the inductance L and quality factor.…”

Section: Converse Me Effect In Bulk Compositesmentioning

confidence: 99%

Recent Progress in Multiferroic Magnetoelectric Composites: from Bulk to Thin Films

Ma¹,

Hu²,

Li³

et al. 2011

Advanced Materials

1,736

915

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Multiferroic magnetoelectric composite systems such as ferromagnetic-ferroelectric heterostructures have recently attracted an ever-increasing interest and provoked a great number of research activities, driven by profound physics from coupling between ferroelectric and magnetic orders, as well as potential applications in novel multifunctional devices, such as sensors, transducers, memories, and spintronics. In this Review, we try to summarize what remarkable progress in multiferroic magnetoelectric composite systems has been achieved in most recent few years, with emphasis on thin films; and to describe unsolved issues and new device applications which can be controlled both electrically and magnetically.

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“…[4][5][6][7][8][9] In such hybrids, the control of the key magnetic properties, such as coercive field, saturation magnetization, or remanent magnetization via electric voltages has been demonstrated recently. [10][11][12][13][14][15][16] A further major development is the demonstration of a reversible, all-electricfield control of magnetization orientation or reversal, and thus of an electrically controlled magnetization switching. [17][18][19][20][21][22][23][24][25][26] However, the literature so far is focused on a nonhysteretic all-electrical magnetization manipulation, i.e., the electricfield induced magnetization changes are volatile in the sense that they return to their initial state upon removing the electric field.…”

Section: Introductionmentioning

confidence: 99%

Nonvolatile, reversible electric-field controlled switching of remanent magnetization in multifunctional ferromagnetic/ferroelectric hybrids

Brandlmaier¹,

Geprägs²,

Woltersdorf³

et al. 2011

Journal of Applied Physics

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In spin-mechanics, the magnetoelastic coupling in ferromagnetic/ferroelectric hybrid devices is exploited in order to realize an electric-voltage control of magnetization orientation. To this end, different voltage-induced elastic strain states are used to generate different magnetization orientations. In our approach, we take advantage of the hysteretic expansion and contraction of a commercial piezoelectric actuator as a function of electrical voltage to deterministically select one of two electro-remanent elastic strain states. We investigate the resulting magnetic response in a nickel thin film/piezoelectric actuator hybrid device at room temperature, using simultaneous magnetooptical Kerr effect and magnetotransport measurements. The magnetic properties of the hybrid can be consistently described in a macrospin model, i.e., in terms of a single magnetic domain. At zero external magnetic field, the magnetization orientation in the two electro-remanent strain states differs by 15 , which corresponds to a magnetoresistance change of 0.5%. These results demonstrate that the spin-mechanics scheme indeed enables a nonvolatile electrically read-and writable memory bit where the information is encoded in a magnetic property.

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Voltage-induced modification in magnetic coercivity of patterned Co50Fe50 thin film on piezoelectric substrate

Cited by 21 publications

References 22 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

Recent Progress in Multiferroic Magnetoelectric Composites: from Bulk to Thin Films

Nonvolatile, reversible electric-field controlled switching of remanent magnetization in multifunctional ferromagnetic/ferroelectric hybrids

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Voltage-induced modification in magnetic coercivity of patterned Co50Fe50 thin film on piezoelectric substrate

Cited by 21 publications

References 22 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

Recent Progress in Multiferroic Magnetoelectric Composites: from Bulk to Thin Films

Nonvolatile, reversible electric-field controlled switching of remanent magnetization in multifunctional ferromagnetic/ferroelectric hybrids

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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