Modulation of the magnetic domain size induced by an electric field

Ando, Fuyuki; Kakizakai, Haruka; Koyama, Tanetoshi; Yamada, Keitaro; Kawaguchi, Masashi; Kim, Sangohoon; Kim, Kab‐Jin; Moriyama, Takahiro; Chiba, Daichi; Ono, Teruo

doi:10.1063/1.4955265

Cited by 56 publications

(46 citation statements)

References 32 publications

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“…In this case the film can exhibit a spin-reorientation transition (SRT) [15][16][17][18] wherein the direction of ferromagnetic ordering transitions from outof-plane (perpendicular) to in-plane. In perpendicularlymagnetized films with small net anisotropy, it is well established that the combination of exchange and dipolar energies leads to the formation of maze-like patterns of magnetic domains [19,20], as observed and studied extensively in ultrathin films of (Fe/Ni)/Cu [21][22][23], Co/Pt [24][25][26], and CoFeB [27]. As the SRT is approached and the net magnetic anisotropy is reduced to zero, it has recently been observed that these domain patterns begin to fluctuate markedly in time.…”

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confidence: 99%

Broadband Spectroscopy of Thermodynamic Magnetization Fluctuations through a Ferromagnetic Spin-Reorientation Transition

Balk¹,

Li²,

Gilbert³

et al. 2018

Phys. Rev. X

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We use scanning optical magnetometry to study the broadband frequency spectra of spontaneous magnetization fluctuations, or “magnetization noise”, in an archetypal ferromagnetic film that can be smoothly tuned through a spin reorientation transition (SRT). The SRT is achieved by laterally varying the magnetic anisotropy across an ultrathin Pt/Co/Pt trilayer, from the perpendicular to in-plane direction, via graded Ar+ irradiation. In regions exhibiting perpendicular anisotropy, the power spectrum of the magnetization noise, S(ν), exhibits a remarkably robust ν−3/2 power law over frequencies ν from 1 kHz to 1 MHz. As the SRT region is traversed, however, S(ν) spectra develop a steadily-increasing critical frequency, ν0, below which the noise power is spectrally flat, indicating an evolving low-frequency cutoff for magnetization fluctuations. The magnetization noise depends strongly on applied in- and out-of-plane magnetic fields, revealing local anisotropies and also a field-induced emergence of fluctuations in otherwise stable ferromagnetic films. Finally, we demonstrate that higher-order correlators can be computed from the noise. These results highlight broadband spectroscopy of thermodynamic fluctuations as a powerful tool to characterize the interplay between thermal and magnetic energy scales, and as a means of characterizing phase transitions in ferromagnets.

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confidence: 99%

Broadband Spectroscopy of Thermodynamic Magnetization Fluctuations through a Ferromagnetic Spin-Reorientation Transition

Balk¹,

Li²,

Gilbert³

et al. 2018

Phys. Rev. X

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“…7,8 Next, we observe magnetic domain structures at demagnetized state by a polar magnetooptical Kerr effect (MOKE) microscope. [28][29][30] We demagnetize the CoFeB by applying an alternative perpendicular magnetic field with exponentially decaying amplitude starting from 20 mT. We record differential image between the demagnetized state and remanent state after the application of dc magnetic field to saturate the magnetization.…”

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confidence: 99%

Effect of electric-field modulation of magnetic parameters on domain structure in MgO/CoFeB

et al. 2016

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We observe magnetic domain structures of MgO/CoFeB with a perpendicular magnetic easy axis under an electric field. The domain structure shows a maze pattern with electric-field dependent isotropic period. The analysis of the period indicates a major role of the electric-field modulation of interfacial magnetic anisotropy for the observation and possible contribution from electric-field modulation of the exchange stiffness constant.

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“…In the magnetic semiconductors, the modulation of the Curie temperature, coercivity, magnetic anisotropy, and anomalous Hall coefficient has been observed [69][70][71][72]. Those studies have triggered the following intensive studies on the modulation of the magnetic properties in metals [73][74][75][76][77][78][79][80][81][82][83][84][85][86]. From memory application viewpoint, one significant breakthrough for E-field effect on metal is found in the demonstration of switching in the MTJ device [77][78][79].…”

Section: Progress Of Vc-mrammentioning

confidence: 99%

A Recent Progress of Spintronics Devices for Integrated Circuit Applications

Endoh

Honjo

2018

JLPEA

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Nonvolatile (NV) memory is a key element for future high-performance and low-power microelectronics. Among the proposed NV memories, spintronics-based ones are particularly attractive for applications, owing to their low-voltage and high-speed operation capability in addition to their high-endurance feature. There are three types of spintronics devices with different writing schemes: spin-transfer torque (STT), spin-orbit torque (SOT), and electric field (E-field) effect on magnetic anisotropy. The NV memories using STT have been studied and developed most actively and are about to enter into the market by major semiconductor foundry companies. On the other hand, a development of the NV memories using other writing schemes are now underway. In this review article, first, the recent advancement of the spintronics device using STT and the NV memories using them are reviewed. Next, spintronics devices using the other two writing schemes (SOT and E-field) are briefly reviewed, including issues to be addressed for the NV memories application.

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Modulation of the magnetic domain size induced by an electric field

Cited by 56 publications

References 32 publications

Broadband Spectroscopy of Thermodynamic Magnetization Fluctuations through a Ferromagnetic Spin-Reorientation Transition

Broadband Spectroscopy of Thermodynamic Magnetization Fluctuations through a Ferromagnetic Spin-Reorientation Transition

Effect of electric-field modulation of magnetic parameters on domain structure in MgO/CoFeB

A Recent Progress of Spintronics Devices for Integrated Circuit Applications

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