Structural Dependence of Magnetic Properties in Co-Based Nanowires: Experiments and Micromagnetic Simulations

Bran, Cristina; Ivanov, Yurii P.; Trabada, Daniel G.; Tomkowicz, J.; Real, R. P. del; Chubykalo‐Fesenko, O.; Vázquez, M.

doi:10.1109/tmag.2013.2254704

Cited by 32 publications

(29 citation statements)

References 37 publications

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“…XRD analysis confirms the presence of a polycrystalline bcc cubic structure with [110] texture for most of CoFe nanowire alloys. Only for the higher Co content (i.e., x ≈ 90, in the studied compositional range), peaks ascribed to [110] fcc cubic structure are observed similarly to that recently reported .…”

Section: Methodssupporting

confidence: 86%

CoFeCu electroplated nanowire arrays: Role of composition and annealing on structure and magnetic properties

Bran

Palmero

Real

et al. 2014

Physica Status Solidi (a)

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CoxFe100−x and CoxFe95−xCu5, with 30 < x < 90, arrays of nanowire, around 20 nm in diameter and about 5 μm long, have been prepared by electrodeposition filling the self‐assembled nanopores of anodic alumina templates. These samples were later thermally annealed for 2 h in the range of temperatures up to 600 °C. Crystalline anisotropy was confirmed to exhibit bcc cubic structure with [110] texture in as‐prepared state. First structural changes are observed after annealing at 450 °C when a refinement of such cubic phase is observed. Annealing at higher temperatures promotes the appearance of Co and Fe oxides. Small addition of Cu to CoFe alloys induces only limited variations in the magnetic properties for as‐prepared samples. Nevertheless, the presence of small Cu content promotes a significant magnetic hardening in comparison with the effect observed in CoFe nanowires. From the temperature dependence of magnetic properties in as‐prepared and annealed samples we conclude a complex contribution of various anisotropy energy terms coming from the annealing and from the presence of Cu. The presence of Cu in small amount induces significant changes in the magnetic properties of annealed CoFeCu nanowires.

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Section: Methodssupporting

confidence: 86%

CoFeCu electroplated nanowire arrays: Role of composition and annealing on structure and magnetic properties

Bran

Palmero

Real

et al. 2014

Physica Status Solidi (a)

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“…In this paper, we report on tailoring of the magnetic properties (i.e., coercivity and remanence) in arrays of FeCoCu magnetic nanowires by suitable thermal treatments as well as by adjusting the nanowires diameters. While in previous studies on FeCo nanowires, 14 the hardening after annealing was also observed, in the present case, the effect is larger probably due to the presence of Cu atoms. A modest reduction of saturation magnetization of nanowires is observed after thermal treatment which, in spite of the corresponding reduction of shape anisotropy, results in increased coercivity.…”

Section: Introductioncontrasting

confidence: 47%

Tuning the magnetization reversal process of FeCoCu nanowire arrays by thermal annealing

Bran

Ivanov

Garcı́a

et al. 2013

Journal of Applied Physics

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Arrays of hexagonally ordered Fe 28 Co 67 Cu 5 nanowires with tailored diameter from 18 to 27 nm were prepared by electroplating into anodic alumina templates and annealed in the temperature range of 300-600 C, preserving but refining their bcc crystal structure. Despite the partial reduction of saturation magnetization and corresponding shape anisotropy after annealing at 500 C, larger coercivity, 0.36 T, and squareness ratio, M r /M s ¼ 0.98, were obtained. This unexpected behavior is interpreted through micromagnetic simulations where the magnetic hardening is associated with the transition from vortex to transverse domain-wall reversal modes connected with the reduction of saturation magnetization. Simulations also predict a significant coercivity increase with decreasing nanowires diameter which agrees with experimental data in the overlapping diameter range. V C 2013 AIP Publishing LLC. [http://dx

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“…The structure can be alternatively tuned by alloying Co with magnetic and/or non-magnetic elements, which can improve the magnetic properties 9 . Co-Fe and Co-Ni alloy nanowire arrays, among others systems, have been intensively studied recently where the main crystalline phase is tailored by properly adjusting the relative composition of magnetic elements in the alloy, thus modifying the magnetic behavior 10,11 . The introduction of a limited content of non-magnetic element can give rise to significant modification of the magnetic behavior and its temperature dependence while it does not reduce significantly the magnetic induction.…”

Section: Introductionmentioning

confidence: 99%

Magnetization reversal dependence on effective magnetic anisotropy in electroplated Co–Cu nanowire arrays

et al. 2015

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Arrays of Co (100-x) Cu (x) (0 ≤ x ≤ 27) nanowires with 45 nm of diameter and 18 µm in length, have been potentiostatically electrodeposited into the hexagonally self-assembled nanopores of anodic alumina membranes. The structural characterization of Co-Cu nanowires confirms the coexistence of both hcp and fcc crystalline phases, with textures that are strongly affected by the fractional content of Cu. Parallel magnetic studies of the room temperature magnetization process by First Order Reversal Curve (FORC) analysis and the angular dependence of coercivity, confirm the presence of two coexisting ferromagnetic phases at intermediate Cu content nanowires, ascribed to a softer magnetic phase for pure Co and a harder magnetic one for the Co-Cu composition alloy, respectively. The temperature dependence of coercivity and remanence reveal a reorientation of the effective magnetic anisotropy with adding Cu into the Co-Cu alloy nanowires, being enhanced by the coexistence of the two ferromagnetic phases.

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Structural Dependence of Magnetic Properties in Co-Based Nanowires: Experiments and Micromagnetic Simulations

Cited by 32 publications

References 37 publications

CoFeCu electroplated nanowire arrays: Role of composition and annealing on structure and magnetic properties

CoFeCu electroplated nanowire arrays: Role of composition and annealing on structure and magnetic properties

Tuning the magnetization reversal process of FeCoCu nanowire arrays by thermal annealing

Magnetization reversal dependence on effective magnetic anisotropy in electroplated Co–Cu nanowire arrays

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