Improving information storage by means of segmented magnetic nanowires

Cisternas, Eduardo; Vogel, E.E.

doi:10.1016/j.jmmm.2015.04.020

Cited by 18 publications

(9 citation statements)

References 19 publications

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“…The magnetostatic interaction between two parallel cylinders has been expressed in an integral form involving Bessel functions [17] in an approach that follows a more general study on the interaction between two magnetic objects [18]. Under the condition ≪ 2 , the magnetostatic energy between any two parallel wires separated by a distance having uniform axial magnetization can put in terms of a general algebraic expression beyond the dipole approximation [12,19]. For the case under study such expression reduces tõ…”

Section: 2mentioning

confidence: 99%

“…There is one hazard present: magnetization reversal [3,[9][10][11] can affect the stored information. To improve the duration of the stored information two mechanisms have been recently proposed: the inscription of an opposite ferromagnetic band (OFB) and the storage of the symbol in a set of bisegmented magnetic nanowires [12,13]. Although the second technique yields the best results in terms of canceling completely repulsive energies coming from magnetic segments interactions it is probably expensive at the moment of fabrication.…”

Section: Introductionmentioning

confidence: 99%

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Stability of Bar Code Information Stored in Magnetic Nanowire Arrays

Cisternas

Vogel

Faundez

2017

Advances in Condensed Matter Physics

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Firmware applications such as security codes, magnetic keys, and similar products can be stored in magnetic bar codes similar to optical bar codes. This can be achieved on the triangular lattice present in porous alumina, whose pori can be filled by magnetic material, over which magnetic bar codes can be inscribed. We study the conditions to improve the durability of the stored information by minimizing the repulsive energy among wires with parallel magnetization within the same bar but interacting with attractive energy with wires in the neighboring bar. The following parameters are varied to minimize the energy of the system: relative amount of magnetization orientation within the bar code area in any orientation, width of the bars, and distribution of wider bars to the outside or to the inside of the code. It is found that durability of the code is favored for equal amount of magnetization in each direction, abundance of narrow bars trying to locate a few wider ones towards the center. Three real commercial optical bar codes taken at random were mapped into magnetic bar codes; it is found that the corresponding magnetic energies are similar to those analyzed here which provides a realistic test for this approach.

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Section: 2mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stability of Bar Code Information Stored in Magnetic Nanowire Arrays

Cisternas

Vogel

Faundez

2017

Advances in Condensed Matter Physics

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“…Such a system relies on the shape anisotropy of each magnetic nanowire as the stabilizing mechanism, avoiding the spontaneous magnetization reversal, but such a stabilization mechanism weakens with the decreasing size of the nanowires [ 24 ]. Improving magnetic data storage has been foreseen to be possible by introducing segmented ferromagnetic nanowires with geometrical or compositional modulations that produce a self-stabilization mechanism [ 25 ]. For some particular geometrical configurations it allows making the magnetostatic interaction among different segments of the nanowire the most important one to stabilize the system, leading to more durable stored information by avoiding the aging phenomenon due to the spontaneous magnetization reversal of individual nanowires, which causes the stored magnetic data to be gradually lost [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Sharp Diameter Geometrical Modulation on the Magnetization Reversal of Bi-Segmented FeNi Nanowires

et al. 2018

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Controlling functional properties of matter and combining them for engineering a functional device is, nowadays, a common direction of the scientific community. For instance, heterogeneous magnetic nanostructures can make use of different types of geometrical and compositional modulations to achieve the control of the magnetization reversal along with the nano-entities and, thus, enable the fabrication of spintronic, magnetic data storage, and sensing devices, among others. In this work, diameter-modulated FeNi nanowires are fabricated paying special effort to obtain sharp transition regions between two segments of different diameters (from about 450 nm to 120 nm), enabling precise control over the magnetic behavior of the sample. Micromagnetic simulations performed on single bi-segmented nanowires predict a double step magnetization reversal where the wide segment magnetization switches near 16 kA/m through a vortex domain wall, while at 40 kA/m the magnetization of the narrow segment is reversed through a corkscrew-like mechanism. Finally, these results are confirmed with magneto-optic Kerr effect measurements at the transition of isolated bi-segmented nanowires. Furthermore, macroscopic vibrating sample magnetometry is used to demonstrate that the magnetic decoupling of nanowire segments is the main phenomenon occurring over the entire fabricated nanowires.

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“…Such a system relays on the shape anisotropy of each magnetic nanowire as the stabilizing mechanism avoiding the spontaneous magnetization reversal, but such stabilization mechanism weakens with the size of the nanowires decreasing [23]. Improving magnetic data storage has been foreseen to be possible by introducing segmented ferromagnetic nanowires with geometrical or compositional modulations that produce a self-stabilization mechanism [24]. For some particular geometrical configurations it allows making the magnetostatic interaction among different segments of the nanowire the most important one to stabilize the system, leading to more durable stored information by avoiding the aging phenomenon due to the spontaneous magnetization reversal of individual nanowires, which causes that the stored magnetic data could be gradually lost [25].…”

Section: Introductionmentioning

confidence: 99%

Effect of Sharp Diameter Geometrical Modulation on the Magnetization Reversal of bi-Segmented FeNi Nanowires

Méndez¹,

Vega²,

González³

et al. 2018

Preprint

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Controlling functional properties of matter and combine them for engineering a functional device is nowadays a common direction of scientific community. For instance, heterogeneous magnetic nanostructures can make use of different types of geometrical and compositional modulations to achieve the control of the magnetization reversal along with the nano-entities and thus enabling the fabrication of spintronic, magnetic data storage and sensing devices, among others. In this work, diameter modulated FeNi nanowires are fabricated paying special effort to obtain sharp transition regions between two segments of different diameters (from about 450 nm to 120 nm), enabling precise control over the magnetic behavior of the sample. Micromagnetic simulations performed on single bi-segmented nanowires predict a double step magnetization reversal where the wide segment magnetization switches near 200 Oe through a vortex domain wall, while at 500 Oe the magnetization of the narrow one is reversed through a corkscrew like mechanism. Finally, these results are confirmed with magneto-optic Kerr effect measurements at the transition of isolated bi-segmented nanowires. Furthermore, macroscopic vibrating sample magnetometry is used to demonstrate that the magnetic decoupling of nanowire segments is the main phenomenon occurring over the entire fabricated nanowires.

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Improving information storage by means of segmented magnetic nanowires

Cited by 18 publications

References 19 publications

Stability of Bar Code Information Stored in Magnetic Nanowire Arrays

Stability of Bar Code Information Stored in Magnetic Nanowire Arrays

Effect of Sharp Diameter Geometrical Modulation on the Magnetization Reversal of Bi-Segmented FeNi Nanowires

Effect of Sharp Diameter Geometrical Modulation on the Magnetization Reversal of bi-Segmented FeNi Nanowires

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