Magnetic reversal modes in cylindrical nanostructures: from disks to wires

Proença, Mariana P.; Rial, J.; Araújo, João P.; Sousa, C. T.

doi:10.1038/s41598-021-89474-z

Cited by 15 publications

(12 citation statements)

References 50 publications

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“…By a similar token, D and t can be chosen so the dominant magnetization within the modulation (bare disk) is a vortex, where chirality can be clockwise or counterclockwise. To focus on how the geometrical parameters of the system influence its magnetic properties, we consider permalloy nanowires, since this material does not exhibit noticeable crystalline anisotropy 54 like Co 55 or Ni 50 for example .…”

Section: System and Methodology 1systemmentioning

confidence: 99%

“…Although we propose here permalloy as the material of study, this is merely by simplicity, although the search for properties in nanowires of other materials is a very actual research field. 50 In this article, we assume that diameter modulated nanowires can eventually store firmware. Thus, one of the main goals of the present paper points to recognize the main role of the modulations: Are they simple spacers or could they also be used to store information?…”

Section: Introductionmentioning

confidence: 99%

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Information storage in permalloy modulated magnetic nanowires

Sáez

Díaz

Cisternas

et al. 2021

Preprint

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A long piece of magnetic material shaped as a central cylindrical wire (diameter d = 50 nm) with two wider coaxial cylindrical portions (diameter D = 90 nm and thickness t = 100 nm) defines a bimodulated nanowire. Micromagnetism is invoked to study the equilibrium energy of the system under the variations of the positions of the modulations along the wire. The system can be thought of as composed of 5 independent elements (3 segments and 2 modulations) leading to 25 = 32 different magnetic configurations. We investigate the stability of the configurations depending on the positions of the modulations. The relative chirality of the modulations has negligible contributions to the energy and they have no effect in the stability of the stored configuration. However, the modulations are extremely important in pinning the domain walls that lead to consider each segment as independent from the rest. A phase diagram reporting the stability of the inscribed magnetic configurations is produced. The stability of the system was then tested under the action of external magnetic fields and it is found that more than 50 mT are necessary to alter the inscribed information. The main purpose of this paper is to find weather a prototype like this can complemented to be used as firmware or magnetic keys. Present results indicate that this is feasible.

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Section: System and Methodology 1systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Information storage in permalloy modulated magnetic nanowires

Sáez

Díaz

Cisternas

et al. 2021

Preprint

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“…1(b), the data is destroyed after being reproduced. Moreover, several fabrication methods have been proposed for the magnetic cylindrical nano-wire, for example template-assisted electrodeposition techniques, 38,39,[43][44][45] and focused electron beam-induced deposition. 46) However, generally, the cylindrical nano-wires have three-dimensional DW.…”

Section: Introductionmentioning

confidence: 99%

Operating characteristics of domain walls in perpendicularly magnetized ferrimagnetic cylindrical nano-wires for three-dimensional magnetic memory

Kurokawa¹,

Yuasa²

2023

Jpn. J. Appl. Phys.

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We observed field- and current-induced domain wall motion (DWM) in a ferrimagnetic cylindrical nano-wire using a micromagnetic simulation. Two types of domain walls, namely the Hedgehog Bloch point (HBP) and transverse domain wall (TDW), can be generated by controlling the initial state of these systems. In the case of the field-induced HBP motion, depinning and Walker breakdown were observed, whereas they did not appear in the field-induced TDW motion. According to the observation of current-induced DWM, we found that the domain wall mobility in ferrimagnetic cylindrical nano-wires is higher than that in conventional ferromagnetic cylindrical nano-wires owing to the small saturation magnetization. The current-induced HBP motion exhibits depinning, unlike the TDW motion, which corresponds to field-driven DWM. These differences are attributed to the symmetry of the magnetization in the domain walls. These results provide notable insight into the design of three-dimensional memory based on current-induced DWM.

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“…Different types of ferromagnetic biphasic nanomaterials have already been reported, including soft/hard and hard/soft core/shell bimagnetic nanostructures, respectively [ 26 , 27 ]. However, few works report on three-layered core/shell cylindrical NWs systems recently investigated, where the magnetization switching processes in these hybrid nanostructures remain yet unexplored [ 13 , 28 , 29 , 30 , 31 , 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

Magnetization Reversal Process and Magnetostatic Interactions in Fe56Co44/SiO2/Fe3O4 Core/Shell Ferromagnetic Nanowires with Non-Magnetic Interlayer

et al. 2021

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Nowadays, numerous works regarding nanowires or nanotubes are being published, studying different combinations of materials or geometries with single or multiple layers. However, works, where both nanotube and nanowires are forming complex structures, are scarcer due to the underlying difficulties that their fabrication and characterization entail. Among the specific applications for these nanostructures that can be used in sensing or high-density magnetic data storage devices, there are the fields of photonics or spintronics. To achieve further improvements in these research fields, a complete understanding of the magnetic properties exhibited by these nanostructures is needed, including their magnetization reversal processes and control of the magnetic domain walls. In order to gain a deeper insight into this topic, complex systems are being fabricated by altering their dimensions or composition. In this work, a successful process flow for the additive fabrication of core/shell nanowires arrays is developed. The core/shell nanostructures fabricated here consist of a magnetic nanowire nucleus (Fe56Co44), grown by electrodeposition and coated by a non-magnetic SiO2 layer coaxially surrounded by a magnetic Fe3O4 nanotubular coating both fabricated by means of the Atomic Layer Deposition (ALD) technique. Moreover, the magnetization reversal processes of these coaxial nanostructures and the magnetostatic interactions between the two magnetic components are investigated by means of standard magnetometry and First Order Reversal Curve methodology. From this study, a two-step magnetization reversal of the core/shell bimagnetic nanostructure is inferred, which is also corroborated by the hysteresis loops of individual core/shell nanostructures measured by Kerr effect-based magnetometer.

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Magnetic reversal modes in cylindrical nanostructures: from disks to wires

Cited by 15 publications

References 50 publications

Information storage in permalloy modulated magnetic nanowires

Information storage in permalloy modulated magnetic nanowires

Operating characteristics of domain walls in perpendicularly magnetized ferrimagnetic cylindrical nano-wires for three-dimensional magnetic memory

Magnetization Reversal Process and Magnetostatic Interactions in Fe56Co44/SiO2/Fe3O4 Core/Shell Ferromagnetic Nanowires with Non-Magnetic Interlayer

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