Experimental study of individual ferromagnetic sub-micron cylinders

Lederman, M.; O’Barr, R.; Schultz, S.

doi:10.1109/20.489774

Cited by 77 publications

(40 citation statements)

References 14 publications

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“…2 of Ref. 6. The angular dependence for column ␤ ͑dϭ0.15 m, Lϭ1.65 m͒ is different in that H s increases slightly as approaches 0 0 .…”

Section: Measurement Of Magnetic Propertiesmentioning

confidence: 95%

“…6 The standard Whatman Al 2 O 3 filters have diameters ranging from ϳ0.25-0.45 m and we can vary the length of the columns prepared by changing the duration or the current density used in the plating process. We have also utilized a series of custom made filters for which the anodization conditions have been adjusted to produce pores with smaller hole sizes.…”

Section: A Anodized Aluminummentioning

confidence: 99%

“…Over the past few years, studies of the switching field versus applied field angle have been made on single-domain rectangular permalloy platelets, 1 barium-ferrite platelets, 2 ␥-Fe 2 O 3 particles, 3 Fe particles, 4 rectangular Ni platelets, 5 and long Ni cylinders. 6 In this article, we describe the preparation, characterization, and magnetic measurements of single-domain elongated Ni columns, and a method used to prepare controlled assemblies of Ni columns in designed configurations.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and quantitative magnetic studies of single-domain nickel cylinders

O’Barr

Lederman

Schultz

et al. 1996

Journal of Applied Physics

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For a complete experimental and theoretical explanation of the magnetic processes in an interacting collection of submicron magnetic particles, a fundamental understanding of the magnetic properties of individual single-domain particles must first be achieved. We have prepared elongated Ni columns ranging in diameter from 0.15 to 1.0 m by electroplating into specially prepared Al 2 O 3 and glass channeled pore membranes. We have also prepared controlled arrays of Ni columns using e-beam lithography, subsequently electroplating into the written patterns. Using transmission electron microscopy, we have characterized the shape, size, morphology, and crystal structure of the columns. Magnetic force microscopy has been used to determine the switching field H s versus the applied field angle of the columns. Although the switching field data can be fit to the functional form for nucleation by curling in an infinite cylinder, the observed weak dependence of H s on column diameter is inconsistent with that expected for curling, particularly for columns of diameter Ͼ0.3 m.

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“…2 of Ref. 6. The angular dependence for column ␤ ͑dϭ0.15 m, Lϭ1.65 m͒ is different in that H s increases slightly as approaches 0 0 .…”

Section: Measurement Of Magnetic Propertiesmentioning

confidence: 95%

Section: A Anodized Aluminummentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Preparation and quantitative magnetic studies of single-domain nickel cylinders

O’Barr

Lederman

Schultz

et al. 1996

Journal of Applied Physics

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“…44 Another effect related to this contribution is the magnetization reorientation transition induced by the interaction field, which was discussed for the linear chain of cylinders, but which has also been reported for other assemblies. [17][18][19]45,46 As discussed above, this transition results with increasing the packing fraction when the shape anisotropy of the single particle and the dipolar term have opposite signs. Qualitatively, this can also be interpreted as a competition between the shape anisotropies of the inner and outer volume and how their respective easy axis are oriented with respect to each other.…”

Section: 39mentioning

confidence: 95%

“…In particular, it should be possible to interpret the vast phenomenology of effects associated to the dipolar interaction or the effective demagnetizing field, within this framework. [13][14][15][16][17][18][19] However, this is usually complicated by the difficulty of finding either adequate expressions or reliable measurements for the dipolar interaction. Furthermore, extensions to include the magnetization or configuration dependency of the dipolar interaction field adds additional difficulties for establishing a suitable description for these systems.…”

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confidence: 99%

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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An Array of Concentric Composite Nanostructures of Zirconia Nanotubules/Cobalt Nanowires: Preparation and Magnetic Properties

Bao

Tie

Xu³

et al. 2002

Adv. Mater.

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Zirconia nanotubules, filled with crystalline cobalt rods (see Figure), were prepared in a reaction sequence of sol–gel crystallization of ZrO2 from zirconyl chloride octahydrate around a template of commercial porous anodic alumina, followed by electrodeposition of cobalt from CoSO4 solution and template removal with 6 N NaOH. The composite shows uniaxial magnetic anisotropy and a coercivity exceeding that of bulk cobalt.

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Experimental study of individual ferromagnetic sub-micron cylinders

Cited by 77 publications

References 14 publications

Preparation and quantitative magnetic studies of single-domain nickel cylinders

Preparation and quantitative magnetic studies of single-domain nickel cylinders

Configuration dependent demagnetizing field in assemblies of interacting magnetic particles

An Array of Concentric Composite Nanostructures of Zirconia Nanotubules/Cobalt Nanowires: Preparation and Magnetic Properties

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