Magnetic phases at the molecular scale: the case of cylindrical Co nanoparticles

Díaz, Pablo; Vogel, E.E.; Muñoz, Francisco

doi:10.1007/s11051-017-3879-6

Cited by 2 publications

(1 citation statement)

References 29 publications

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“…In general, the aspect ratio between the length and diameter of a ferromagnetic cylinder defines three possible minimum energy configurations: ferromagnetic in-plane (I), ferromagnetic out-of-plane (II) and vortex (III) 52 . If segments are long enough their preferred magnetization will point in any of the two directions along the axis 53 .…”

Section: System and Methodology 1systemmentioning

confidence: 99%

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%

Information storage in permalloy modulated magnetic nanowires

Sáez

Díaz

Cisternas

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

Information storage in permalloy modulated magnetic nanowires

Sáez

Díaz

Cisternas

et al. 2021

Sci Rep

View full text Add to dashboard Cite

A long piece of magnetic material shaped as a central cylindrical wire (diameter $$d=50$$ d = 50 nm) with two wider coaxial cylindrical portions (diameter $$D=90$$ D = 90 nm and thickness $$t=100$$ 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 five independent elements (3 segments and 2 modulations) leading to $$2^5=32$$ 2 5 = 32 possible different magnetic configurations, which will be later simplified to 4. 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 on 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 was found that more than 50 mT are necessary to alter the inscribed information. The main purpose of this paper is to find whether a prototype like this can be complemented to be used as a magnetic key or to store information in the form of firmware. Present results indicate that both possibilities are feasible.

show abstract

Magnetic phases at the molecular scale: the case of cylindrical Co nanoparticles

Cited by 2 publications

References 29 publications

Information storage in permalloy modulated magnetic nanowires

Information storage in permalloy modulated magnetic nanowires

Information storage in permalloy modulated magnetic nanowires

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