Template-Assisted CoPd Nanowire Arrays: Magnetic Properties and FORC Analysis

Vega, V.; Rosa, W.O.; Garcı́a, J.A.; Sánchez, T.; Santos, Joana; Béron, Fanny; Pirota, K. R.; Prida, V.M.; Hernando, B.

doi:10.1166/jnn.2012.4908

Cited by 20 publications

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“…As Ni is incorporated in the composition, the hcp phase nearly disappears, and fcc-crystal phase is detected [21,34]. For CoPd nanowires, fcc-phase is nearly the only observed for Pd content higher than 27%, while for the Co-richer content both fcc and hcp phases are detected [23,35,47,48]. In addition, thermal and magnetic field annealing can induce in some cases modifications in the crystalline structure [49].…”

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confidence: 99%

Magnetization reversal in Co‐base nanowire arrays

Vázquez

Vivas

2011

Physica Status Solidi (b)

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The magnetic behaviour of ordered arrays of magnetic nanowires is controlled by the combined action of anisotropy energy terms determined by geometrical shape, crystalline structure and magnetostriction, as well as by the magnetostatic interactions among them. A number of works have been reported on the role of magnetostatic interaction in arrays of nanowires, sometimes focusing on nanowires with vanishing crystalline and magnetostrictive energy terms. Here, in turn we are interested in Co‐base nanowires whose magnetocrystalline anisotropy plays a very important role. Arrays of Co‐base nanowires offer novel, sometimes unexpected behaviour that is not fully understood. Such results are connected to their magnetocrystalline anisotropy, and to their complex magnetization reversal mode. Arrays of Co and Co‐base nanowires have been fabricated by template‐assisted method, by electroplating into highly ordered self‐assembled pores of nanoporous alumina membranes. Their hcp or fcc crystal structure is confirmed to depend on length of nanowires as well as on the presence of selected elements in the composition. The magnetic behaviour of these arrays has been experimentally investigated as a function of (i) geometry (e.g. diameter and, particularly short length) and (ii) composition (e.g. adding Ni or Pd). A complementary study on its temperature dependence reveals the nature of the dominant anisotropy, while the angular dependence of hysteresis loops (e.g. coercivity and remanence) enables a deeper analysis of the magnetization reversal process. Micromagnetic reversal modes are reviewed and modelling and simulations procedures introduced. Complex rotational mechanisms are concluded to be responsible for the reversal process following micromagnetic modes distinct from those pure classically established. SEM image of an array of Co‐base nanowires.

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confidence: 99%

Magnetization reversal in Co‐base nanowire arrays

Vázquez

Vivas

2011

Physica Status Solidi (b)

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“…Furthermore, this method can provide some extent of composition control and selectivity by choosing adequate current density values. Therefore, it has been used for the electrodeposition of metallic/magnetic alloy nanowires (Vega et al, 2012b) and multilayered structures (Weihnacht et al, 2003).…”

Section: Galvanostatic Electrodepositionmentioning

confidence: 99%

Electrochemical methods for template-assisted synthesis of nanostructured materials

Prida

Vega

Garcı́a

et al. 2015

Magnetic Nano- And Microwires

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“…Co-rich Co-Pd nanowires have been synthesized in AAO templates by DC [24][25][26][27] and AC [28] electrodeposition techniques; the main results reported indicate that the arrays are ferromagnetic, with an easy magnetization axis parallel to the wire length (that is, out of the alumina substrate plane); for small and medium Pd contents both, the coercivity and the reduced remanence or squareness S (¼ J R /J S ), decrease. However, little is known about Pdrich nanowire arrays.…”

Section: Introductionmentioning

confidence: 99%

Magnetic hysteresis in small-grained Co Pd1− nanowire arrays

Viqueira

López

Urreta

et al. 2015

Journal of Magnetism and Magnetic Materials

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a b s t r a c tCo-Pd nanowires with small grain size are fabricated by AC electrodeposition into hexagonally ordered alumina pores, 20-35 nm in diameter and about 1 mm long. The effects of the alloy composition, the nanowire diameter and the grain size on the hysteresis properties are considered. X-ray diffraction indicates that the nanowires are single phase, a fcc Co-Pd solid solution; electron microscopy results show that they are polycrystalline, with randomly oriented grains (7-12 nm), smaller than the wire diameter. Nanowire arrays are ferromagnetic, with an easy magnetization axis parallel to the nanowire long axis. Both, the coercive field and the loop squareness monotonously increase with the Co content and with the grain size, but no clear correlation with the wire diameter is found. The Co and Co-rich nanowire arrays exhibit coercive fields and reduced remanence values quite insensitive to temperature in the range 4 K-300 K; on the contrary, in Pd-rich nanowires both magnitudes are smaller and they largely increase during cooling below 100 K. These behaviors are systematized by considering the strong dependences displayed by the magneto-crystalline anisotropy and the saturation magnetostriction on composition and temperature. At low temperatures the effective anisotropy value and the domain-wall width to grain size ratio drastically change, promoting less cooperative and harder nucleation modes.

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Template-Assisted CoPd Nanowire Arrays: Magnetic Properties and FORC Analysis

Cited by 20 publications

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Magnetization reversal in Co‐base nanowire arrays

Magnetization reversal in Co‐base nanowire arrays

Electrochemical methods for template-assisted synthesis of nanostructured materials

Magnetic hysteresis in small-grained Co Pd1− nanowire arrays

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