Magnetic properties of Fe-Co-Ni films with high saturation magnetization prepared by evaporation and electrodeposition

Omata, Y.

doi:10.1109/tjmj.1990.4564098

Cited by 16 publications

(9 citation statements)

References 5 publications

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“…In addition, in a very recent study, nanocrystalline Ni-Co-Fe coatings were electroplated on copper plates from a sulfate-citrate PS at different Co ion concentrations [3]. To make magnetic Fe-Co-Ni thin films, researchers can use many methods such as evaporation and electrochemical deposition [48]. Among these, thin films obtained by the electrochemical deposition method have very high uniformity.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Deposition of Fe–Co–Ni Samples with Different Co Contents and Characterization of Their Microstructural and Magnetic Properties

et al. 2022

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In this study, to explore the effect of Co contents on the electroplated Fe–Co–Ni samples, three different Fe–Co33–Ni62, Fe–Co43–Ni53, and Fe–Co61–Ni36 samples were electrochemically grown from Plating Solutions (PSs) containing different amounts of Co ions on indium tin oxide substrates. Compositional analysis showed that an increase in the Co ion concentration in the PS gives rise to an increment in the weight fraction of Co in the sample. In all samples, the co–deposition characteristic was described as anomalous. The samples exhibited a predominant reflection from the (111) plane of the face–centered cubic structure. However, the Fe–Co61–Ni36 sample also had a weak reflection from the (100) plane of the hexagonal close–packed structure of Co. An enhancement in the Co contents caused a strong decrement in the crystallinity, resulting in a decrease in the size of the crystallites. The Fe–Co33–Ni62 sample exhibited a more compact surface structure comprising only cauliflower–like agglomerates, while the Fe–Co43–Ni53 and Fe–Co61–Ni36 samples had a surface structure consisting of both pyramidal particles and cauliflower–like agglomerates. The results also revealed that different Co contents play an important role in the surface roughness parameters. From the magnetic analysis of the samples, it was understood that the Fe–Co61–Ni36 sample has a higher coercive field and magnetic squareness ratio than the Fe–Co43–Ni53 and Fe–Co33–Ni62 samples. The differences observed in the magnetic characteristics of the samples were attributed to the changes revealed in their phase structure and surface roughness parameters. The obtained results are the basis for the fabrication of future magnetic devices.

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Section: Introductionmentioning

confidence: 99%

Electrochemical Deposition of Fe–Co–Ni Samples with Different Co Contents and Characterization of Their Microstructural and Magnetic Properties

et al. 2022

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“…With increasing storage density, the need for recording heads to write on high-coercivity media at high frequencies has raised new requirements for the write-head material that cannot be met by Ni 80 Fe 20 . New soft magnetic materials with higher saturation flux density B s such as electroplated CoFe alloys, − CoFeNi alloys, − CoFeCu alloys, ,− other CoFe-based alloys, − sputtered FeN films, , and other Fe-based alloys 43-45 have been developed.…”

Section: Introductionmentioning

confidence: 99%

Electroplating of Nanocrystalline CoFeNi Soft Magnetic Thin Films from a Stable Citrate-Based Bath

Zhang

Ivey

2004

Chem. Mater.

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CoFeNi alloys are some of the most studied soft magnetic materials because of their superior properties over FeNi alloys as write head core materials in hard-disk-drives. Electroplating processes have major significance in the fabrication of thin-film recording heads due to their advantages of simplicity, cost-effectiveness, and controllable patterning. Conventional low pH (2.5-3.0) baths suffer from problems such as poor stability, low current density efficiency, and voids in deposited films due to the electroplating of hydrogen. A new, stable citrate-based bath has been developed in this study. Citrate can effectively improve the stability of CoFeNi plating baths, and denser CoFeNi films can be plated out because of the higher bath pH (>5). The effects of bath composition and plating conditions on the electroplating of CoFeNi thin films have been studied. CoFeNi thin films with preferred composition, mixed fcc-bcc phases, and 10-20 nm grain sizes have been plated out from the new citrate-based bath.

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“…The maximum operating temperature of the undulator will be reached when either the magnetic material passes the Curie temperature, the internal stress of the magnetic material increases significantly due to annealing, or the polymer used to isolate the windings from the magnetic yoke decomposes. The curie temperature of Co 65 Ni 12 Fe 23 is typically in excess of 800 C [23]. The internal stress of magnetic alloys containing Ni and Fe anneal to high stress in excess of 250 C and the polymer SU-8 decomposes in vacuum at 280 C, setting a maximum operating temperature of 250 C.…”

Section: B Managing the Fieldmentioning

confidence: 99%

Surface-micromachined magnetic undulator with period length between10 μmand 1 mm for advanced light sources

Harrison

Joshi

Lake

et al. 2012

Phys. Rev. ST Accel. Beams

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A technological gap exists between the m-scale wiggling periods achieved using electromagnetic waves of high intensity laser pulses and the mm scale of permanent-magnet and superconducting undulators. In the sub-mm range, surface-micromachined soft-magnetic micro-electro-mechanical system inductors with integrated solenoidal coils have already experimentally demonstrated 100 to 500 mT field amplitude across air gaps as large as 15 m. Simulations indicate that magnetic fields as large as 1.5 T across 50 m inductor gaps are feasible. A simple rearranging of the yoke and pole geometry allows for fabrication of 10+ cm long undulator structures with period lengths between 12:5 m and 1 mm. Such undulators find application both in high average power spontaneous emission sources and, if used in combination with ultrahigh-brightness electron beams, could lead to the realization of low energy compact free-electron lasers. Challenges include electron energy broadening due to wakefields and Joule heating in the electromagnet.

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Magnetic properties of Fe-Co-Ni films with high saturation magnetization prepared by evaporation and electrodeposition

Cited by 16 publications

References 5 publications

Electrochemical Deposition of Fe–Co–Ni Samples with Different Co Contents and Characterization of Their Microstructural and Magnetic Properties

Electrochemical Deposition of Fe–Co–Ni Samples with Different Co Contents and Characterization of Their Microstructural and Magnetic Properties

Electroplating of Nanocrystalline CoFeNi Soft Magnetic Thin Films from a Stable Citrate-Based Bath

Surface-micromachined magnetic undulator with period length between10 μmand 1 mm for advanced light sources

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