Open Access
Uniaxial Magnetic Anisotropy Energy of Fe Wires Embedded in Carbon
TLDR
In this article, the magnetic anisotropy energy (MAE) of Fe cylinders embedded within zigzag carbon nanotubes was analyzed and it was shown that the easy axis changes from parallel to perpendicular with respect to the cylinder axis.Abstract:
In this work, we analyze the magnetic anisotropy energy (MAE) of Fe cylinders embedded within zigzagcarbonnanotubes,bymeansofabinitiocalculations.Toseetheinfluenceoftheconfinement,wefixtheFe cylinder diameter and we follow the changes of the MAE as a function of the diameter of the nanotube, which contains the Fe cylinder. Wefind that the easy axis changes from parallel to perpendicular, with respect to the cylinder axis. The orientation change depends quite strongly on the confinement, which indicates a nontrivial dependence of the magnetization direction as function of the nanotube diameter. We alsofind that the MAE is affected by where the Fe cylinder sits with respect to the carbon nanotube, and the coupling between these two structures could also dominate the magnetic response. We analyze the thermal stability of the magnetization orientation of the Fe cylinder close to room temperature.read more
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A nanogel based oral gene delivery system targeting SUMOylation machinery to combat gut inflammation
Prabhu Srinivas Yavvari,Priyanka Verma,Salman Ahmad Mustfa,Sanjay Pal,Sandeep Kumar,Anand Kumar Awasthi,Vineet Ahuja,C. V. Srikanth,Aasheesh Srivastava,Avinash Bajaj +9 more
TL;DR: This study presents engineering of orally deliverable nanogels that can target SUMOylation machinery to combat gut inflammation with very high efficacy and shows that plasmid delivery using TAC6-derived nanogel diminished gut inflammation in a murine colitis model.
Journal ArticleDOI
Finite size effects on the magnetocrystalline anisotropy energy in Fe magnetic nanowires from first principles
Francisco Muñoz,Francisco Muñoz,Alessandra Romero,Alessandra Romero,José Mejía-López,J. L. Morán-López +5 more
TL;DR: In this article, the magnetic moments and magnetocrystalline anisotropy energy of bcc-Fe nanowires with z-axis along the (110) direction are calculated in the framework of ab initio theories.
Journal ArticleDOI
Stability of magnetic nanoparticles inside ferromagnetic nanotubes
TL;DR: In this paper, the stability of small magnetic particles inside magnetic nanotubes was investigated and the results showed that multisegmented nanotube are more efficient to entrap the particles at temperatures up to hundreds of kelvins.
Journal ArticleDOI
Confinement of magnetic nanoparticles inside multisegmented nanotubes by means of magnetic field gradients
TL;DR: In this article, the possibility of confining magnetic nanoparticles inside multisegmented nanotubes by using strong field gradients is considered by means of Monte Carlo simulations, which is reduced to the random walk performed by the nanoparticle on the energy landscape produced by the tube's magnetic field.
Journal ArticleDOI
Impact of surface strain on the spin dynamics of deposited Co nanowires
O. P. Polyakov,J. G. Korobova,O. V. Stepanyuk,Dmitry I. Bazhanov,Dmitry I. Bazhanov,Dmitry I. Bazhanov +5 more
Abstract: Tailoring the magnetic properties at atomic-scale is essential in the engineering of modern spintronics devices. One of the main concerns in the novel nanostructured materials design is the decrease of the paid energy in the way of functioning, but allowing to switch between different magnetic states with a relative low-cost energy at the same time. Magnetic anisotropy (MA) energy defines the stability of a spin in the preferred direction and is a fundamental variable in magnetization switching processes. Transition-metal wires are known to develop large, stable spin and orbital magnetic moments together with MA energies that are orders of magnitude larger than in the corresponding solids. Different ways of controlling the MA have been exploited such as alloying, surface charging, and external electrical fields. Here we investigate from a first-principle approach together with dynamic calculations, the surface strain driven mechanism to tune the magnetic properties of deposited nanowires. We consider as a...
References
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Journal ArticleDOI
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Georg Kresse,Jürgen Hafner +1 more
TL;DR: In this paper, the authors present an ab initio quantum-mechanical molecular-dynamics calculations based on the calculation of the electronic ground state and of the Hellmann-Feynman forces in the local density approximation.
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Georg Kresse,Jürgen Hafner +1 more
TL;DR: The simulation allows us to study in detail the changes in the structure-property relationship through the metal-semiconductor transition, and a detailed analysis of the local structural properties and their changes induced by an annealing process is reported.
Journal ArticleDOI
A molecular dynamics method for simulations in the canonical ensemble
TL;DR: In this paper, a molecular dynamics simulation method which can generate configurations belonging to the canonical (T, V, N) ensemble or the constant temperature constant pressure ensemble was proposed, which is tested for an atomic fluid (Ar) and works well.
Book
Physics of ferromagnetism
聡信 近角,C. D. Graham +1 more
TL;DR: Magnetic properties of magnetism have been studied in a wide range of applications, including magnetism of amorphous materials, magnetism and magnetostriction as mentioned in this paper, spin distribution and domain walls.