Structure and magnetization of arrays of electrodeposited Co wires in anodic alumina

Strijkers, Gustav J.; Dalderop, Jhj Hans; Broeksteeg, Maa; Swagten, Hjm Henk; Jonge, de Wjm Wim

doi:10.1063/1.371490

Cited by 165 publications

(103 citation statements)

References 18 publications

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“…All nanowires show a strong shape anisotropy with the easy axis being parallel to the long axis of the wires. Co nanowires additionally show a temperature dependent magnetocrystalline anisotropy along the hexagonal c-axis, which is directed nearly perpendicular to the long axis of the wires, as is confirmed by X-Ray diffraction measurements [1] and reported by Strijkers et al who performed NMR measurements on samples prepared in a similar way [2]. Therefore, at low temperatures and for large wire diameters a competition between magnetocrystalline and shape anisotropies can be observed.…”

Section: Introductionsupporting

confidence: 60%

“…The domain is likely to be formed near structural defects or at the ends of the wire. Apart from the shape anisotropy Co nanowires show a temperature and size dependent magnetocrystalline anisotropy along the hexagonal c-axis, which is directed nearly perpendicular to the long axis of the nanowire [1,2]. Therefore, at low temperatures wires with a large pore diameter show a hysteresis in the magnetization curve for both the magnetic field applied parallel and perpendicular to the long axes of the wires (cf.…”

Section: Discussionmentioning

confidence: 99%

“…This can be attributed to the fact that in all the wires a mixture of fcc-Co and hcp-Co can be found. The amount of fcc-Co increases if the pore diameter decreases [1,2]. Fcc-Co, however, does not show a significant magnetocrystalline anisotropy.…”

Section: Discussionmentioning

confidence: 99%

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Magnetization reversal and magnetic anisotropy of Fe, Ni and Co nanowires in nanoporous alumina membranes

et al. 2001

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The magnetization reversal and magnetic anisotropy of Fe, Ni and Co nanowires is studied at low temperatures. All nanowires show a strong shape anisotropy with the easy axis being parallel to the long axis of the wires. Co nanowires additionally show a temperature dependent magnetocrystalline anisotropy along the hexagonal c-axis, which is directed nearly perpendicular to the long axis of the wires, as is confirmed by X-Ray diffraction measurements [1] and reported by Strijkers et al. who performed NMR measurements on samples prepared in a similar way [2]. Therefore, at low temperatures and for large wire diameters a competition between magnetocrystalline and shape anisotropies can be observed. Co wires with a small diameter, however, do not show a significant magnetocrystalline anisotropy. Fcc-Co, which is only known as a high-temperature Co modification and which does not have a large magnetocrystalline anisotropy constant, becomes the predominant Co modification here [ 1,3]. Investigations on the size dependence of the switching field for Fe and Ni nanowires provide information about the magnetization reversal process, which takes place via a nucleation of small magnetic domains probably at the end of the wires, and subsequent propagation of the domain wall along the wire.

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Section: Introductionsupporting

confidence: 60%

Section: Discussionmentioning

confidence: 99%

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Magnetization reversal and magnetic anisotropy of Fe, Ni and Co nanowires in nanoporous alumina membranes

et al. 2001

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“…For example, the diameters of the nanowires grown into the pores of the membranes of all three types will have the same nominal size of 200 nm, making an investigation of the size effect of nanowires difficult. 21 As mentioned above, the porous alumina membranes have been used in fabricating metal nanowires through electrodeposition. One way to characterize the nanowires is to dissolve the membranes in NaOH solution and then image the nanowires with SEM.…”

mentioning

confidence: 99%

Fabrication of Alumina Nanotubes and Nanowires by Etching Porous Alumina Membranes

et al. 2002

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Porous alumina membranes are commercially available and have been widely used in recent nanoscale research, for example, as templates in nanowire fabrication through electrodeposition. In this report, we present a new use for porous alumina membranes in the fabrication of alumina nanotubes/nanowires desired in electrochemical devices and catalytic applications. A high yield of alumina nanotubes/nanowires is obtained by etching porous alumina membranes in an aqueous sodium hydroxide solution. We studied the effects of etching time and solution concentration and characterized the alumina nanotubes/nanowires using a scanning electron microscope (SEM). A discussion of the possible mechanism for the formation of nanotubes/nanowires is given. Our results also imply that in nanowire fabrication through the template approach where alumina membranes are removed with sodium hydroxide solution to release the nanowires special attention is needed in characterizing the nanowires with the SEM because alumina nanotubes/nanowires can be easily mistaken for electrodeposited nanowires.

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“…This, for example, has been obtained by several authors. 26,27 A consequence of this result is that the dipolar part of the total or effective anisotropy field (…”

Section: A Saturated Statementioning

confidence: 97%

Configuration dependent demagnetizing field in assemblies of interacting magnetic particles

Martínez-Huerta

Medina

Piraux

et al. 2013

J. Phys.: Condens. Matter

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A mean field model is presented for the configuration dependent effective demagnetizing and anisotropy fields in assemblies of exchange decoupled magnetic particles of arbitrary shape which are expressed in terms of the demagnetizing factors of the particles and the volumetric shape containing the assembly. Perpendicularly magnetized 2D assemblies have been considered, for which it is shown that the demagnetizing field is lower than the continuous thin film. As an example of these 2D systems, arrays of bistable cylindrical nanowires have been characterized by remanence curves as well as ferromagnetic resonance, which have served to show the correspondence of these measurements with the model and also to validate the mean field approach. Linear chains of cylinders and spheres have been analyzed leading to simple expressions to describe the easy axis rotation induced by the interaction field in chains of low aspect ratio cylindrical particles, and the dipolar magnetic anisotropy observed in the linear chain of spheres. These examples serve to underline the dependence on the dipolar interaction field and effective demagnetizing factor on the contributions that arise from the shape of the outer volume.

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Structure and magnetization of arrays of electrodeposited Co wires in anodic alumina

Cited by 165 publications

References 18 publications

Magnetization reversal and magnetic anisotropy of Fe, Ni and Co nanowires in nanoporous alumina membranes

Magnetization reversal and magnetic anisotropy of Fe, Ni and Co nanowires in nanoporous alumina membranes

Fabrication of Alumina Nanotubes and Nanowires by Etching Porous Alumina Membranes

Configuration dependent demagnetizing field in assemblies of interacting magnetic particles

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