Co100−xFex magnetic thick films prepared by electrodeposition

Aguirre, María del Carmen; Farias, Emanuel Airton de Oliveira; Abraham, J. J.; Urreta, S.E.

doi:10.1016/j.jallcom.2014.11.197

Cited by 26 publications

(14 citation statements)

References 21 publications

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“…A 3DI-Vd mechanism is also found in the present work for short times (30 s), but other 3DP contributions become dominant at longer times. However, for cobalt deposition on a copper foil substrate from 0.1 M CoCl 2 , without any addition of boric acid, we found that Co deposition on Cu substrates is well described by a 3DP-Vd mechanism, 22 while for Co on brass studied in the present work, an initial 3DI regime is observed with a transition to a 3DP one, controlled by diffusion, in the second stage.…”

Section: Resultscontrasting

confidence: 54%

“…It has been reported that adsorbed H stabilizes the [110] orientation while H 2 favors the [210] orientation. 4 The electrocrystallization mechanisms of alloyed Fe−Co thick films on Cu substrates have been recently reported; 22 depending on the iron alloy content, different kinetics and microstructures are observed. Co deposition on Cu substrates is well described by a 3DP-Vd mechanism.…”

Section: Resultsmentioning

confidence: 99%

“…These models have also been successfully applied to describe electrodeposition of two different elements to obtain alloyed Fe–Co thick films; in this case, the values of the parameters estimated from the CTT curves are in fact effective values, depending on the two species involved in the deposition process.…”

Section: Methodsmentioning

confidence: 99%

“…These models have also been successfully applied to describe electrodeposition of two different elements to obtain alloyed Fe−Co thick films; 22 3D type nucleation processes, in which nuclei growth is controlled by adatoms incorporation to the lattice (Li), have been proposed by Armstrong−Fleischmann and Thirsk (AFT). 17 This model describes a three-dimensional (3D) instantaneous or progressive nucleation mechanism, with nucleus growth limited by incorporation of atoms at lattice sites on the surface of the solid (Li); it takes into account the overlapping of growing nuclei with the geometry of rightcircular cones.…”

Section: Introductionmentioning

confidence: 99%

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Nucleation and Growth Mechanisms in Cu–Co Films

et al. 2016

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Nucleation and growth mechanisms in Co, Cu, and Co x Cu 100−x single films, and in Co x Cu 100−x /Cu bilayers, electrodeposited on Cu 70 Zn 30 brass substrates, are studied by the constant potential technique. The recorded current−time transients (CTTs) are rather complex, and they extend for long times. Co, Cu, and Co x Cu 100−x alloys electrocrystallize onto brass, undergoing a process with more than a single maximum during the CTTs, as if two or more consecutive nucleation steps were present. The first stage of electrocrystallization in Co and Co x Cu 100−x films involves 3D instantaneous nucleation, but then, at long times, a progressive nucleation regime predominates. CTTs in Cu/brass and in Cu/Co x Cu 100−x /brass bilayers are well fitted by a 2DP progressive nucleation process at the initial stage, while for longer growing times a transition to a 3DP regime is observed, in which film growth becomes controlled by adatoms incorporation to the lattice. Film morphologies observed by SEM are consistent with these growth mechanisms. XRD results indicate that pure Co layers are hcp phase, while Cu and Cu−Co layers have an fcc lattice. Films are soft ferromagnetic, with an "in-plane" magnetization easy axis; there is evidence of crystallographic texture, which should be responsible for the higher coercivity observed in the "out-ofplane" configuration, with the applied field perpendicular to the film plane.

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Section: Resultscontrasting

confidence: 54%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nucleation and Growth Mechanisms in Cu–Co Films

et al. 2016

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“…Each of these quality levels differs in their composition and heating treatment to obtain the properties of ferromagnetic materials that are appropriate to their needs or use. The magnetic material of the CoFe alloy is an important hard magnet because it has unique magnetic properties, including high magnetization saturation, high permeability, high coercivity, and good thermal stability [7,8]…”

Section: Introductionmentioning

confidence: 99%

THE EFFECT OF COBALT CONTENT ON MAGNETIC PROPERTIES OF CoFe ALLOYS

Nursiyanto

Rohman

et al. 2020

SPEKTRA

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Hard Disk Drive (HDD) as a data storage device when operated with high temperatures (around 66oC), its function will be constrained. The CoFe alloys have a large coercivity field and can be patterned in very small sizes that are suitable for HDD devices. In this study, Co1-x Fex cube alloy was used (x = 0.25; 0.30; 0.50; 0.75). Samples were treated with temperature changes to get the Curie temperature. The coercivity field value is obtained by giving the external field and temperature below Curie temperature and also above Curie temperature to the samples. The VAMPIRE software is a micromagnetic simulation program based on atomistic models. The results showed that Curie’s temperature decreased when Co content increased. The composition of Co0.25 Fe0.75 has the highest Curie temperature that is equal to 1075 K. The temperature Curie is not affected by the size of the cube. When the sample is given a temperature rise below the Curie temperature, the value of the coercivity field decreases. The value of the coercivity field is very difficult to determine when the temperature used is above the Curie temperature. The percentage of composition does not affect the coercivity field value. Therefore, cube-shaped CoFe material is very suitable for use as a material data storage device operated at temperatures below the Curie.

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