Electroless CoNiFeB soft magnetic thin films with high corrosion resistance

Yokoshima, Tokihiko; Kaneko, D.; Akahori, Mio; Nam, Hyo Seung; Osaka, Tetsuya

doi:10.1016/s0022-0728(00)00172-8

Cited by 45 publications

(30 citation statements)

References 25 publications

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“…Some additives are employed to increase resistivity by incorporating S, 15,16 C, 17,18 and B. 19 Other additives are used to reduce stress and improve the appearance of the film. Deposits obtained from electrolytes containing additives are reported to decrease the saturation magnetization and increase the coercivity.…”

Section: Introductionmentioning

confidence: 99%

Dependence of magnetic properties on micro- to nanostructure of CoNiFe films

Rhen

Roy

2008

Journal of Applied Physics

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The magnetic properties of electrodeposited CoNiFe films with thicknesses varying from 0.20 to 10 μm were studied. The films show a single face-centered-cubic CoNiFe phase with grain sizes ranging from 23 to 29 nm. The coercivity is controlled by a combination of the morphology and nanocrystalline structure of the deposits. The nanocrystalline grain size determines the intrinsic coercivity associated with crystalline anisotropy as in the random anisotropy model, whereas an additional morphology term of coercivity is controlled by the thickness inhomogeneity on a submicron scale. The thin films show considerable roughness and a higher coercivity, up to a level of 560 A m−1 (7.0 Oe) in 250 nm films. The thick films show coercivity values of as low as 16 A m−1 (0.2 Oe). The coercivity dependence on thickness was fitted using a simple model combining a morphology dependent additional contribution term to the random anisotropy model as Hc=Hcmorph+Hcanis. Good agreement between the model and the experimental results was obtained.

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Section: Introductionmentioning

confidence: 99%

Dependence of magnetic properties on micro- to nanostructure of CoNiFe films

Rhen

Roy

2008

Journal of Applied Physics

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“…A number of electrolessly deposited CoNiFe materials have been reported [9,10,20] and the atomic percentage (at. %) compositions are typically Co (55-77), Ni (12)(13)(14)(15)(16)(17)(18) Fe (9-23) although a recent work [24] has highlighted Fe rich deposits such as It has been illustrated many times in the literature that the deposit composition and characteristics depend significantly on the bath composition.…”

Section: Alloy Composition and Deposition Ratementioning

confidence: 99%

“…A number of groups have recently reported the electroless deposition of magnetic materials. Osaka [19][20][21] and coworkers have investigated electroless magnetic alloys and shown that higher B sat values can be obtained from deposits using dimethylamine borane (DMAB) rather than hypophosphite as the reducing agent. This has been attributed to differences in the crystallite structure and codeposited elements.…”

Section: Introductionmentioning

confidence: 99%

Electroless thin film CoNiFe–B alloys for integrated magnetics on Si

Rohan¹,

Ahern²,

Reynolds³

et al. 2009

Electrochimica Acta

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“…NiCoFe ternary alloys, rich in Co, have been reported with higher saturation magnetic flux density and lower coercivity than Permalloy (Ni 80 Fe 20 ), which can be used to develop more sensitive thin film magnetic heads for high-density recording. [6][7][8][9][10][11][12][13][14][15][16][17][18][19] Also, NiCoFe ternary alloys, rich in Fe, have also been noted for their low thermal expansion property. Commercial applications of these alloys include microwave guides, spacecraft optics, laser housings, and printed wired boards.…”

Section: Introductionmentioning

confidence: 99%

Thermal Synthesis of Nanocrystalline (CoxNi1-x)yFe1-y KOVAR Alloy through Gaseous Reduction of Mixed Oxides

et al. 2008

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KOVAR is a very interesting and widely applied Fe-Ni-Co alloy. Nanocrystalline KOVAR alloy is successfully synthesized in the present investigation. The effect of hydrogen reduction on composition, microstructure and magnetic properties of produced Fe-Ni-Co alloy is investigated. A molar ratio of (99.9%) nickel oxide, cobalt oxide and ferric oxide for synthesis of 29% Ni-17% Co-Fe (KOVAR) alloy were thoroughly mixed and compressed into compacts. The dried compacts were reduced partially and completely at 500, 600, 700 and 800 C in a constant flowing hydrogen gas atmosphere (100% H 2 ). The course of reduction was followed up using the thermogravimetric technique to study the reduction behavior and kinetics reaction mechanism. The initial dried powder and the various reduction products were characterized by XRD, VSM, FE-SEM, EDX and reflected light microscope. At the higher reaction temperature (700-800 C) complete reduction was achieved with synthesis of nanocrystalline (13.9 nm) Fe-Ni-Co alloy. The activation energy values were calculated from the Arrhenius equation, and the approved mathematical formulations for the gas solid reaction were applied. It was found that the initial and final reduction stages are controlled by the combined gaseous diffusion and interfacial chemical reaction mechanisms.

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Electroless CoNiFeB soft magnetic thin films with high corrosion resistance

Cited by 45 publications

References 25 publications

Dependence of magnetic properties on micro- to nanostructure of CoNiFe films

Dependence of magnetic properties on micro- to nanostructure of CoNiFe films

Electroless thin film CoNiFe–B alloys for integrated magnetics on Si

Thermal Synthesis of Nanocrystalline (Co<SUB>x</SUB>Ni<SUB>1-x</SUB>)<SUB>y</SUB>Fe<SUB>1-y</SUB> KOVAR Alloy through Gaseous Reduction of Mixed Oxides

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