Ultrasoft magnetic properties of Co–Fe–Hf–O nanocomposite films

Ha, N.D.; Phan, Manh‐Huong; Tuấn, Lê Anh; Phan, The‐Long; Kim, C. G.; Kim, C. O.; Yu, Seong Cho

doi:10.1002/pssa.200777173

Cited by 5 publications

(1 citation statement)

References 8 publications

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“…FeCo‐based soft magnetic thin‐film materials have attracted much attention and are extensively investigated 6–8 due to their high 4 πM s , low coercivity ( H c ), and high permeability. A single FeCoB‐layer film with thickness of 200 nm showed a high resonance frequency of 6.4 GHz and stable µ ′ of 70 up to 3 GHz, low damping constant α and resistivity ρ 9.…”

Section: Introductionmentioning

confidence: 99%

Soft magnetic multilayer films with wide frequency band losses and high resistivity

Ma¹

2011

Physica Status Solidi (a)

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A series of CoFeB/MgO multilayers was fabricated by means of DC/RF magnetron sputtering. It is observed that the electromagnetic properties of the multilayers of CoFeB/MgO are closely related with the thickness of CoFeB sublayers, and the soft magnetic properties of discontinuous multilayers are affected by the cycle number of CoFeB/MgO bilayers. The optimized film of [Co 64 Fe 24 B 12 (0.7 nm)/MgO(0.4 nm)] 50 exhibits a magnetic loss m 00 larger than 100 and m 0 larger than 80 between 0.9 and 2.1 GHz. The electrical resistivity r of this film is as high as 3.75 Â 10 3 mV cm. The results indicate that this discontinuous CoFeB/MgO multilayer film has potential to serve as a noise suppressor or EMC materials in the GHz frequency range.

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Section: Introductionmentioning

confidence: 99%

Soft magnetic multilayer films with wide frequency band losses and high resistivity

Ma¹

2011

Physica Status Solidi (a)

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Synthesis of bulk FeHfBO soft magnetic materials and its loss characterization at megahertz frequency

Zhou

Kou

et al. 2013

Journal of Applied Physics

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Magnetic core materials with low loss, high saturation magnetization, large permeability, and operating frequency above 1 MHz are in high demands for the next generation of miniaturized power electronics. Amorphous FeHfB ribbons with thickness around 20 μm have been fabricated through melt-spinning. Different heat treatments were performed on the FeHfB ribbons, and the relations among heat treatments, microstructure, and magnetic properties have been explored. Properties such as coercivity (Hc) of 2.0 Oe and saturation magnetic flux density (BS) of 1.2 T have been achieved in samples with exchange coupling. The losses can be minimized by balancing the hysteretic and eddy current losses and can be further reduced with additional magnetic field annealing. At 5 MHz with peak magnetic flux density of 20 mT, the materials show core losses comparable to the best ferrites, but with higher permeability value of about 200 and superior saturation induction of more than 1 T.

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Soft magnetic nanocomposite CoZrTaB–SiO2 thin films for high-frequency applications

Cronin

Lordan²,

Wei³

et al. 2020

Journal of Applied Physics

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With increasing switching frequencies for passive components in power supplies, there lies a demand for materials that exhibit excellent soft magnetic properties at high frequencies. Electrical resistivity is of particular importance, as a high value is of significant importance in suppressing eddy current loss. The present work is focused on improving material with ultra-soft magnetic properties at high working frequencies by making nanocomposite CoZrTaB–SiO2 thin films using co-sputtering. The films show an increasing trend of resistivity with SiO2 incorporation, attributed to the high degree of electron scattering based on a metal–insulator–metal network. The ultra-low coercivity (Hc ∼ 0.1 Oe) and enhanced anisotropic field (Hk ∼ 42 Oe) of films were correlated to the ferromagnetic exchange coupling, which were significantly affected by a small concentration of SiO2. Relatively high permeability, ultra-low loss response, and high ferromagnetic resonance frequency make this material a promising candidate for replacing conventional magnetic cores in passives, in addition to noise suppression applications.

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Ultrasoft magnetic properties of Co–Fe–Hf–O nanocomposite films

Cited by 5 publications

References 8 publications

Soft magnetic multilayer films with wide frequency band losses and high resistivity

Soft magnetic multilayer films with wide frequency band losses and high resistivity

Synthesis of bulk FeHfBO soft magnetic materials and its loss characterization at megahertz frequency

Soft magnetic nanocomposite CoZrTaB–SiO2 thin films for high-frequency applications

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