Strain Mediated in‐Plane Uniaxial Magnetic Anisotropy in Amorphous CoFeB Films Based on Structural Phase Transitions of BaTiO<sub>3</sub> Single‐Crystal Substrates

Isogami, Shinji; Taniyama, Tomoyasu

doi:10.1002/pssa.201700762

Cited by 8 publications

(4 citation statements)

References 17 publications

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“…The strains in the a 1 (a 2 ) domains change by u xx /u xx ≈ 124% (−46%) and u yy /u yy ≈ −46% (124%). agree with previous studies considering similar systems [25,57]. Figures 4(a), 4(c), and 4(d) show the calculated field dependence of the change of the equilibrium angle ψ eff between H eff and the x axis under laser excitation.…”

Section: B Laser-induced Change Of Magnetoelastic Anisotropysupporting

confidence: 89%

Laser-Induced Magnetization Precession in Individual Magnetoelastic Domains of a Multiferroic Co40Fe40B20/BaTiO

et al. 2020

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Using a magneto-optical pump-probe technique with micrometer spatial resolution, we show that magnetization precession can be launched in individual magnetic domains imprinted in a Co 40 Fe 40 B 20 layer by elastic coupling to ferroelectric domains in a BaTiO 3 substrate. The dependence of the precession parameters on the strength and orientation of the external magnetic field reveals that laser-induced ultrafast partial quenching of the magnetoelastic coupling parameter of Co 40 Fe 40 B 20 by approximately 27% along with 10% ultrafast demagnetization triggers the magnetization precession. The relation between the laser-induced reduction of the magnetoelastic coupling and the demagnetization is approximated by an n(n + 1)/2 law with n ≈ 2. This correspondence confirms the thermal origin of the laser-induced anisotropy change. Based on analysis and modeling of the excited precession, we find signatures of laser-induced precessional switching, which occurs when the magnetic field is applied along the hard magnetization axis and its value is close to the effective magnetoelastic anisotropy field. The precessionexcitation process in an individual magnetoelastic domain is found to be unaffected by neighboring domains. This makes laser-induced changes of magnetoelastic anisotropy a promising tool for driving magnetization dynamics and switching in composite multiferroics with spatial selectivity.

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Section: B Laser-induced Change Of Magnetoelastic Anisotropysupporting

confidence: 89%

Laser-Induced Magnetization Precession in Individual Magnetoelastic Domains of a Multiferroic Co40Fe40B20/BaTiO

et al. 2020

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“…1(e)]. The magnetoelastic anisotropy energy associated with the 90°in-plane magnetization rotation B 1 (u yy − u xx ) = −2.17 • 10 4 mJ/cm 3 and the magnetostriction coefficient λ = 8 • 10 −6 agree with previous works considering similar systems [25,61].…”

supporting

confidence: 87%

Laser-induced magnetization precession in individual magnetoelastic domains of a multiferroic CoFeB/BaTiO$_3$ composite

Shelukhin,

Pertsev,

Scherbakov

et al. 2020

Preprint

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Using a magneto-optical pump-probe technique with micrometer spatial resolution we show that magnetization precession can be launched in individual magnetic domains imprinted in a Co40Fe40B20 (CoFeB) layer by elastic coupling to ferroelectric domains in a BaTiO 3 substrate. The dependence of the precession parameters on external magnetic field strength and orientation reveals that laser-induced ultrafast partial quenching of the magnetoelastic coupling parameter of CoFeB by ∼15 % along with 5 % ultrafast demagnetization trigger the magnetization precession. The relation between laser-induced reduction of the magnetoelastic coupling and the demagnetization can be well approximated by the n(n + 1)/2-law with n=2 corresponding to the uniaxial anisotropy, confirming the thermal origin of the laser-induced anisotropy change. The excitation process in an individual magnetoelastic domain is found to be unaffected by neighboring domains. This makes laser-induced changes of magnetoelastic anisotropy a promising tool for driving magnetization dynamics in composite multiferroics with spatial selectivity.

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“…In general, variations in H c indicate that the pinning effects of the magnetic domain movements are present or absent owing to substrate roughness or impurities [40]. Additionally, variations in M r /M s imply that multi-grains or magnetic domains are composed of magnetic anisotropies of various orientations [43,44]. These values (H c and M r /M s ) can be used to qualitatively evaluate the magnetic anisotropy of a sample [38,45,46].…”

Section: Magnetic Properties With Deformable Substratesmentioning

confidence: 99%

Magnetic Properties of Amorphous Ta/CoFeB/MgO/Ta Thin Films on Deformable Substrates with Magnetic Field Angle and Tensile Strain

Jun,

Hwang,

Kang

et al. 2023

Sensors

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Recently, the application of cobalt iron boron (CoFeB) thin films in magnetic sensors has been widely studied owing to their high magnetic moment, anisotropy, and stability. However, most of these studies were conducted on rigid silicon substrates. For diverse applications of magnetic and angle sensors, it is important to explore the properties of ferromagnetic thin films grown on nonrigid deformable substrates. In this study, representative deformable substrates (polyimide (PI), polyethylene naphthalate (PEN), and polydimethylsiloxane (PDMS)), which can be bent or stretched, were used to assess the in-plane magnetic field angle-dependent properties of amorphous Ta/CoFeB/MgO/Ta thin films grown on deformable substrates. The effects of substrate roughness, tensile stress, deformable substrate characteristics, and sputtering on magnetic properties, such as the coercive field (Hc), remanence over saturation magnetization (Mr/Ms), and biaxial characteristics, were investigated. This study presents an unconventional foundation for exploring deformable magnetic sensors capable of detecting magnetic field angles.

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Strain Mediated in‐Plane Uniaxial Magnetic Anisotropy in Amorphous CoFeB Films Based on Structural Phase Transitions of BaTiO₃ Single‐Crystal Substrates

Cited by 8 publications

References 17 publications

Laser-Induced Magnetization Precession in Individual Magnetoelastic Domains of a Multiferroic Co40Fe40B20/BaTiO

Laser-Induced Magnetization Precession in Individual Magnetoelastic Domains of a Multiferroic Co40Fe40B20/BaTiO

Laser-induced magnetization precession in individual magnetoelastic domains of a multiferroic CoFeB/BaTiO$_3$ composite

Magnetic Properties of Amorphous Ta/CoFeB/MgO/Ta Thin Films on Deformable Substrates with Magnetic Field Angle and Tensile Strain

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Strain Mediated in‐Plane Uniaxial Magnetic Anisotropy in Amorphous CoFeB Films Based on Structural Phase Transitions of BaTiO3 Single‐Crystal Substrates

Cited by 8 publications

References 17 publications

Laser-Induced Magnetization Precession in Individual Magnetoelastic Domains of a Multiferroic Co40Fe40B20/BaTiO

Laser-Induced Magnetization Precession in Individual Magnetoelastic Domains of a Multiferroic Co40Fe40B20/BaTiO

Laser-induced magnetization precession in individual magnetoelastic domains of a multiferroic CoFeB/BaTiO$_3$ composite

Magnetic Properties of Amorphous Ta/CoFeB/MgO/Ta Thin Films on Deformable Substrates with Magnetic Field Angle and Tensile Strain

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Strain Mediated in‐Plane Uniaxial Magnetic Anisotropy in Amorphous CoFeB Films Based on Structural Phase Transitions of BaTiO₃ Single‐Crystal Substrates