In-plane magnetic anisotropy and coercive field dependence upon thickness of CoFeB

Kipgen, Lalminthang; Fulara, Himanshu; Raju, M.; Chaudhary, Sujeet

doi:10.1016/j.jmmm.2012.05.012

Cited by 49 publications

(13 citation statements)

References 21 publications

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“…The strong UMA observed in the as-deposited films can be attributed to the stress during the growth. Similar trend was observed in CoFeB materials deposited on Si substrates, which was attributed to stress relief in the film at a specific thickness [25,26]. Again, it suggests the strong UMA observed in the as-deposited films mainly be induced by stress during the growth.…”

Section: Methodssupporting

confidence: 75%

Magnetic, thermal, electrical properties and crystallization kinetics of Co60Fe20B20 alloy films

Wang

Huang

et al. 2016

Sci. China Mater.

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Magnetic, thermal and electrical properties of sputtered Co60Fe20B20 alloy films are investigated. An excellent linear relationship between the saturation magnetization per unit area and thickness is obtained in the as-deposited film with thickness ranging from 10 to 100 nm. For the as-deposited films a high effective saturation magnetization of 793.7 ± 42.9 emu cm −3 is derived from the fitting. An in-plane uniaxial magnetic anisotropy of~10 4 erg cm −3 in magnitude is revealed by angular dependent magnetic measurements. A fourfold cubic magnetic anisotropy is found to develop with annealing, in line with the improvement of the crystalline structure in the film confirmed by X-ray diffraction measurements. Thermomagnetic measurements reveal a considerable variation of the saturation magnetization with temperature arising from the competition of the crystallization and the temperature dependent ferromagnetic behavior of the alloy film. Pronounced changes in electrical resistivity with temperature were observed in the alloy film, in accompany with the structural change. The activation barrier for crystallization was determined to be 1.43 eV from the electrical measurements with variable heating rates, showing a good thermal stability of the alloy film.

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Section: Methodssupporting

confidence: 75%

Magnetic, thermal, electrical properties and crystallization kinetics of Co60Fe20B20 alloy films

Wang

Huang

et al. 2016

Sci. China Mater.

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“…Therefore, this effect also points to a large amount of APBs. It has been reported [46][47][48] that the coercive field usually decreases with increasing film thickness. This effect has been attributed to the reduced defect density for thicker films.…”

Section: Discussionmentioning

confidence: 98%

Modifying magnetic properties of ultra-thin magnetite films by growth on Fe pre-covered MgO(001)

Schemme

Krampf

Bertram³

et al. 2015

Journal of Applied Physics

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Iron oxide films were reactively grown on iron buffer films, which were deposited before on MgO(001) substrates to analyze the influence of the initial iron buffer layers on the magnetic properties of the magnetite films. X-ray photoelectron spectroscopy and low energy electron diffraction showed that magnetite films of high crystalline quality in the surface near region were formed by this two-step deposition procedure. The underlying iron film, however, was completely oxidized as proved by x-ray reflectometry and diffraction. The structural bulk quality of the iron oxide film is poor compared to magnetite films directly grown on MgO(001). Although the iron film was completely oxidized, we found drastically modified magnetic properties for these films using the magnetooptic Kerr effect. The magnetite films had strongly increased coercive fields, and their magnetic in-plane anisotropy is in-plane rotated by 458 compared to magnetite films formed directly by one step reactive growth on MgO(001). V C 2015 AIP Publishing LLC.

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“…Glancing incidence XRD (GIXRD) measurements (with an incident angle of 1°) of CFB films with different thickness was performed and the spectra are shown in Figure (1). The spectra show a common presence of a broad peak near 44.5°, which suggests the highly nanocrystalline (or amorphous) growth of CFB films [27] [28]. Fitting this hump using combination of a Gaussian and a Lorentzian function, the full width at half maxima is calculated, which is in the range of 8°-12°, yielding a crystallite size less than 1 nm.…”

Section: A X-ray Diffraction (Xrd) Studymentioning

confidence: 99%

Impact of Ferromagnetic Layer Thickness on the Spin Pumping in Co60Fe20B20/Ta Bilayer Thin Films

Hait

Husain

Gupta

et al. 2021

Preprint

Self Cite

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We report the tuneable spin angular momentum transfer (spin pumping) from Co60Fe20B20 (CFB) amorphous alloy into the Ta heavy metal nanolayers. All the films are grown on Si (100) substrate at room temperature using ion-beam sputtering technique. Structural studies reveal that the grown Ta films over amorphous CFB are crystalline even at ultrathin regime. The bilayers possess very low interface roughness (<0.5 nm) and are continuous throughout the thickness range. Comparative analysis of the spin pumping in CFB (4, 6 and 8 nm) as a function of the Ta thickness (vary from 1 to 10 nm in step of 1nm) has been performed employing ferromagnetic resonance (FMR) spectroscopy. It is observed that the effective damping increase exponentially with the increase of Ta i.e., follows ballistic spin transport) in two series of CFB (4nm)/Ta (0-10nm) and CFB(6nm)/Ta (0-10nm) bilayers, which is characteristic of normal spin pumping. However, the anomalous behaviour has been observed for CFB (8nm)/Ta (0-10nm) bilayer series where the spin current generated in Ta with the thicker CFB behaves oppositely. The results demonstrate the strong dependence of ferromagnet thickness on the spin pumping into the Ta nanolayers. This study paves the way to choose suitable ferromagnetic layer thickness for spin current induced switching applications in spintronics.

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In-plane magnetic anisotropy and coercive field dependence upon thickness of CoFeB

Cited by 49 publications

References 21 publications

Magnetic, thermal, electrical properties and crystallization kinetics of Co60Fe20B20 alloy films

Magnetic, thermal, electrical properties and crystallization kinetics of Co60Fe20B20 alloy films

Modifying magnetic properties of ultra-thin magnetite films by growth on Fe pre-covered MgO(001)

Impact of Ferromagnetic Layer Thickness on the Spin Pumping in Co60Fe20B20/Ta Bilayer Thin Films

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