Spin configuration in isolated FeCoCu nanowires modulated in diameter

Iglesias-Freire, Óscar; Bran, Cristina; Berganza, Eider; Mínguez-Bacho, Ignacio; Magén, Cesar; Vázquez, M.; Asenjo, A.

doi:10.1088/0957-4484/26/39/395702

Cited by 30 publications

(36 citation statements)

References 34 publications

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“…A high resolution Magnetic Force Microscopy 28 has been used to determine the domain configuration of the individual NWs 29 . Even more, thanks to the advanced VF-MFM modes 30 the reversal magnetization process and the magnetostatic coupling between segments can be analyzed.…”

Section: Introductionmentioning

confidence: 99%

Multisegmented Nanowires: a Step towards the Control of the Domain Wall Configuration

Berganza

Jaafar

Bran

et al. 2017

Sci Rep

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Cylindrical nanowires synthesized by controlled electrodeposition constitute excellent strategic candidates to engineer magnetic domain configurations. In this work, multisegmented CoNi/Ni nanowires are synthesized for tailoring a periodic magnetic structure determined by the balance between magnetocrystalline and magnetostatic energies. High-resolution Transmission Electron Microscopy confirms the segmented growth and the sharp transition between layers. Although both CoNi and Ni segments have similar fcc cubic crystal symmetry, their magnetic configuration is quite different as experimentally revealed by Magnetic Force Microscopy (MFM) imaging. While the Ni segments are single domain with axial magnetization direction, the CoNi segments present two main configurations: a single vortex state or a complex multivortex magnetic configuration, which is further interpreted with the help of micromagnetic simulations. This original outcome is ascribed to the tight competition between anisotropies. The almost monocrystalline fcc structure of the CoNi segments, as revealed by the electron diffraction patterns, which is atypical for its composition, contributes to balance the magnetocrystalline and shape anisotropies. The results of MFM measurements performed under in-plane magnetic field demonstrate that it is possible to switch from the multivortex configuration to a single vortex configuration with low magnetic fields.

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Section: Introductionmentioning

confidence: 99%

Multisegmented Nanowires: a Step towards the Control of the Domain Wall Configuration

Berganza

Jaafar

Bran

et al. 2017

Sci Rep

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“…The final aim of this study is to determine the local magnetic configuration along individual nanowires and to show the pinning effect of the bamboo-like geometry in FeCoCu nanowires making use of an advanced Magnetic Force Microscopy (MFM) technique 23 24 . MFM is a recognized powerful technique to image the local magnetization configuration 25 as well as the magnetization reversal process at the nanoscale 26 .…”

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confidence: 99%

Domain wall pinning in FeCoCu bamboo-like nanowires

Berganza

Bran

Jaafar

et al. 2016

Sci Rep

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The three dimensional nature of cylindrical magnetic nanowires has opened a new way to control the domain configuration as well as the magnetization reversal process. The pinning effect of the periodic diameter modulations on the domain wall propagation in FeCoCu individual nanowires is determined by Magnetic Force Microscopy, MFM. A main bistable magnetic configuration is firstly concluded from MFM images characterized by the spin reversal between two nearly single domain states with opposite axial magnetization. Complementary micromagnetic simulations confirm a vortex mediated magnetization reversal process. A non-standard variable field MFM imaging procedure allows us to observe metastable magnetic states where the propagating domain wall is pinned at certain positions with enlarged diameter. Moreover, it is demonstrated that it is possible to control the position of the pinned domain walls by an external magnetic field.

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“…Control of the shape anisotropy and demagnetization energy can be achieved by depositing NWs into templates modulated in diameter Fig. 4c [64], [91]- [93], [108] and controlling their length either by monitoring the total deposited charge (total length of the NW) or by introducing nonmagnetic segments between magnetic segments and monitoring each segments' length ( Fig. 4d) [45], [94], [109]- [112].…”

Section: B Electroplating Of Cylindrical Nanowiresmentioning

confidence: 99%

Cylindrical Magnetic Nanowires Applications

et al. 2021

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Cylindrical magnetic nanowires feature unique properties, which make them attractive for fundamental research as well as novel applications. These one-dimensional structures introduce a pronounced shape anisotropy that together with material selection can strongly affect the magnetic properties and can be tuned by incorporating segments of different materials or diameters along the length. They attract a large interest in the scientific community, ranging from physicists to material scientists to bioengineers. Consequently, these nanowires are developed for and employed in very diverse applications in medicine, biology, data and energy storage, catalysis or microwave electronics, among others. In this review we investigate the most active emerging applications of cylindrical nanowires grown in alumina templates by electrochemical deposition. This method has several key features, including low cost and a high level of control over the design. A fundamental property that distinguishes those applications is the operating frequency, which we chose to apply as an underlying structure for this review. With this we attempt to provide a wide and organized view of applications based on cylindrical magnetic nanowires with a focus on tailored physical and chemical properties.

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Spin configuration in isolated FeCoCu nanowires modulated in diameter

Cited by 30 publications

References 34 publications

Multisegmented Nanowires: a Step towards the Control of the Domain Wall Configuration

Multisegmented Nanowires: a Step towards the Control of the Domain Wall Configuration

Domain wall pinning in FeCoCu bamboo-like nanowires

Cylindrical Magnetic Nanowires Applications

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