Spin configuration of cylindrical bamboo-like magnetic nanowires

Bran, Cristina; Berganza, Eider; Palmero, Ester M.; Fernández-Roldán, José Ángel; Real, R. P. del; Aballe, Lucía; Foerster, Michael; Asenjo, A.; Rodríguez, A. Fraile; Vázquez, M.

doi:10.1039/c5tc04194e

Cited by 59 publications

(69 citation statements)

References 28 publications

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“…S2 in the Supplemental Material [26]). From the bright/dark pattern of the whole shadow, the presence of vortex domains structure with alternating chirality along the nanowire surface is concluded, similar to those observed in Co nanowires [21].…”

Section: A Magnetic Measurements Of Single Nanowiressupporting

confidence: 55%

“…XMCD-PEEM has successfully been employed to identify Bloch-point domain walls in permalloy nanowires characterized by axial domains [23]. Vortex domains with circumferential magnetization at the surface and longitudinal at the core very recently have been confirmed in Co nanowires [21].…”

Section: Introductionmentioning

confidence: 99%

“…Since the Co 85 Ni 15 15 . However, one should also take into account that the anisotropy energy partly is minimized for the vortex domains by slight displacement of the core from the axial position [21]. Additionally, the domain walls between the vortex domains are more complex and require more exchange energy than those between the transverse domains.…”

Section: B Micromagnetic Simulationsmentioning

confidence: 99%

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Direct observation of transverse and vortex metastable magnetic domains in cylindrical nanowires

et al. 2017

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We present experimental evidence of transverse magnetic domains, previously observed only in nanostrips, in CoNi cylindrical nanowires with designed crystal symmetry and tailored magnetic anisotropy. The transverse domains are found together with more conventional vortex domains along the same cylindrical nanowire, denoting a bistable system with similar energies. The surface and the inner magnetization distribution in both types of domains are analyzed by photoemission electron microscopy with x-ray magnetic circular dichroism contrast, and hysteresis loop in individual nanowires are measured by magneto-optical Kerr effect. These experimental data are understood and compared with complementary micromagnetic simulations.

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Section: A Magnetic Measurements Of Single Nanowiressupporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Section: B Micromagnetic Simulationsmentioning

confidence: 99%

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Direct observation of transverse and vortex metastable magnetic domains in cylindrical nanowires

et al. 2017

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“…Another way is to use modulations of diameter to create potential barriers with a view to keep the wall in a given area (Bochmann et al 2018). Yet another way is to proceed to demagnetization with a magnetic field applied transverse to the wire/tube axis (Biziere et al 2013, Da Col et al 2014, Da Col et al 2016, Bran et al 2016b, which seems to be the most efficient method. To the contrary, it seems that domain walls nucleate spontaneously towards remanence, whatever the direction of previous saturation, in the case of tubes with azimuthal magnetization (Staňo et al 2017b).…”

Section: Wall Type Stimulusmentioning

confidence: 99%

Magnetic Nanowires and Nanotubes

Staňo

Fruchart

2018

Handbook of Magnetic Materials

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We propose a review of the current knowledge about the synthesis, magnetic properties and applications of magnetic cylindrical nanowires and nanotubes. By nano we consider diameters reasonably smaller than a micrometer. At this scale, comparable to micromagnetic and transport length scales, novel properties appear. At the same time, this makes the underlying physics easier to understand due to the limiter number of degrees of freedom involved. The three-dimensional nature and the curvature of these objects contribute also to their specific properties, compared to patterns flat elements. While the topic of nanowires and later nanotubes started now decades ago, it is nevertheless flourishing, thanks to the progress of synthesis, theory and characterization tools. These give access to ever more complex and thus functional structures, and also shifting the focus from material-type measurements of large assemblies, to single-object investigations. We first provide an overview of common fabrication methods yielding nanowires, nanotubes and structures engineered in geometry (change in diameter, shape) or material (segments, core-shell structures), shape or core-shell. We then review their magnetic properties: global measurements, magnetization states and switching, single domain wall statics and dynamics, and spin waves. For each aspect, both theory and experiments are surveyed. We also mention standard characterization techniques useful for these. We finally mention emerging applications of magnetic nanowires and nanotubes, along with the foreseen perspectives in the topic.

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“…Most recently, an upgrade of this synthesis method consists in the fabrication of multisegmented nanowires embedded into the pores of these NAMs by changing the sample composition from one layer to the other [22][23][24], or by varying the diameter size of each nanowire segment [25][26][27][28][29]. These synthesis methods are novel strategies of rising interest for the development of nanomaterials with fine-tuned magnetic anisotropy in a controlled way [30], which plays a pivotal role in determining the magnetic properties and, therefore, allowing for the ability of tailoring the relative orientation of magnetization between each magnetic segment, in order for these multicomponent nanowires to trigger new applications, as in multibit magnetic recording media [31,32].…”

Section: Introductionmentioning

confidence: 99%

Ni-Co Alloy and Multisegmented Ni/Co Nanowire Arrays Modulated in Composition: Structural Characterization and Magnetic Properties

et al. 2017

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Design of novel multisegmented magnetic nanowires can pave the way for the next generation of data storage media and logical devices, magnonic crystals, or in magneto-plasmonics, among other energy conversion, recovery, and storage technological applications. In this work, we present a detailed study on the synthesis, morphology, structural, and magnetic properties of Ni, Co, and Ni-Co alloy and multisegmented Ni/Co nanowires modulated in composition, which were grown by template-assisted electrodeposition employing nanoporous anodic aluminum oxide as patterned templates. X-ray diffraction, and scanning and high-resolution transmission electron microscopies allowed for the structural, morphological, and compositional investigations of a few micrometers long and approximately 40 nm in diameter of pure Ni and Co single elements, together with multisegmented Ni/Co and alloyed Ni-Co nanowires. The vibrating sample magnetometry technique enabled us to extract the main characteristic magnetic parameters for these samples, thereby evaluating their different anisotropic magnetic behaviors and discuss them based on their morphological and structural features. These novel functional magnetic nanomaterials can serve as potential candidates for multibit magnetic systems in ultra-high-density magnetic data storage applications.

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Spin configuration of cylindrical bamboo-like magnetic nanowires

Abstract: The surface and the internal magnetic structure of bamboo-like cylindrical nanowires with tailored diameter modulations have been determined by XMCD/PEEM and MFM.

Cited by 59 publications

References 28 publications

Direct observation of transverse and vortex metastable magnetic domains in cylindrical nanowires

Direct observation of transverse and vortex metastable magnetic domains in cylindrical nanowires

Magnetic Nanowires and Nanotubes

Ni-Co Alloy and Multisegmented Ni/Co Nanowire Arrays Modulated in Composition: Structural Characterization and Magnetic Properties

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