Tuning of uniaxial magnetic anisotropy in amorphous CoFeB films

Cui, Bai; Song, Cheng; Wang, Yuyan; Yan, Wen; Zeng, Fanhao; Pan, Feng

doi:10.1088/0953-8984/25/10/106003

Cited by 29 publications

(14 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…/m 3 , and both x and y as easy uniaxial anisotropy directions. This uniaxial anisotropy constant is consistent for instance with the magnetocrystalline anisotropy values of thin Fe 40 Co 40 B 20 films[23].…”

supporting

confidence: 86%

See 1 more Smart Citation

Domain wall engineering through exchange bias

Albisetti

Petti

2016

Journal of Magnetism and Magnetic Materials

View full text Add to dashboard Cite

The control of the structure and position of magnetic domain walls is at the basis of the development of different magnetic devices and architectures. Several nanofabrication techniques have been proposed to geometrically confine and shape domain wall structures; however, a fine tuning of the position and micromagnetic configuration is hardly achieved, especially in continuous films. This work shows that, by controlling the unidirectional anisotropy of a continuous ferromagnetic film through exchange bias, domainwalls whose spin arrangement is generally not favored by dipolar and exchange interactions can be created. Micromagnetic simulations reveal that the domain wall width, position and profile can be tuned by establishing an abrupt change in the direction and magnitude of the exchange bias field set in the system

show abstract

supporting

confidence: 86%

“…The parameters employed for the simulations were: cell size 10 nm x 10 nm x 5 nm, saturation magnetization M s = 750 kA/m, damping coefficient α = 0.5 and exchange stiffness A ex = 1.2 10 -11 J/m [22], [23]. The uniaxial anisotropy was neglected, apart from the simulations of Fig.…”

Section: Computational Detailsmentioning

confidence: 99%

Domain wall engineering through exchange bias

Albisetti

Petti

2016

Journal of Magnetism and Magnetic Materials

View full text Add to dashboard Cite

show abstract

“…26 These material parameters can also be varied by varying the thickness of the nonmagnetic layers adjacent to the magnetic layer. 23,26 Also, attempts have been made to reduce I sw by reducing M s 27 and D (/ K u / H k ) 28,29 in experiments. To discuss these phenomena when using a finite pulse current, we investigated the effects of M s and K u on I sw for t p ¼ 1 ns.…”

mentioning

confidence: 99%

Reducing the switching current with a Gilbert damping constant in nanomagnets with perpendicular anisotropy

Yamada

Oomaru

Nakamura

et al. 2015

Applied Physics Letters

View full text Add to dashboard Cite

We report on current-induced magnetization switching in a nanomagnet with perpendicular anisotropy, and investigate the effects of the damping constant (α) on the switching current (Isw) by varying the nanosecond-scale pulse current duration (tp), the saturation magnetization (Ms), and the magnetocrystalline anisotropy (Ku). The results show that reduction of α below a certain threshold (αc) is ineffective in reducing Isw for short tp. When tp is short, it is necessary to reduce both α and Ms simultaneously until αc is reached to reduce Isw. The results presented here offer a promising route for the design of ultrafast information storage and logic devices using current-induced magnetization switching.

show abstract

“…We would like to note that it is a controversial issue about the 3d hole numbers of Fe and Co in magnetic amorphous films. While Cui et al 36 use the m orb /n h to present their data, Kanai et al 37 numbers of Co and Fe in the amorphous films by first-principles calculations, and they found the similar values to those of the bulk Fe and Co films. 34,37 In this work, we have used the values of n 3d for Fe and Co of 6.61 and 7.51, respectively, from 37 to calculate the spin and orbital moment of Co and Fe in the CoFeB film.…”

Section: -4mentioning

confidence: 99%

Element specific spin and orbital moments of nanoscale CoFeB amorphous thin films on GaAs(100)

Yan

et al. 2016

AIP Advances

View full text Add to dashboard Cite

Nanoscale CoFeB amorphous films have been synthesized on GaAs(100) and studied with Xray magnetic circular dichroism (XMCD) and transmission electron microscopy (TEM). We have found that the ratios of the orbital to spin magnetic moments of both the Co and Fe in the ultrathin amorphous film have been enhanced by more than 300% compared with those of the bulk crystalline Co and Fe, and in specifically, a large orbital moment of 0.56 µ B from the Co atoms has been observed and at the same time the spin moment of the Co atoms remains comparable to that of the bulk hcp Co. The results indicate that the large uniaxial magnetic anisotropy (UMA) observed in the ultrathin CoFeB film on GaAs(100) is related to the enhanced spin-orbital coupling of the Co atoms in the CoFeB. This work offers experimental evidences of the correlation between the UMA and the elementary specific spin and orbital moments in the CoFeB amorphous film on the GaAs(100) substrate, which is significant for spintronics applications.

show abstract

Tuning of uniaxial magnetic anisotropy in amorphous CoFeB films

Cited by 29 publications

References 37 publications

Domain wall engineering through exchange bias

Domain wall engineering through exchange bias

Reducing the switching current with a Gilbert damping constant in nanomagnets with perpendicular anisotropy

Element specific spin and orbital moments of nanoscale CoFeB amorphous thin films on GaAs(100)

Contact Info

Product

Resources

About