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
Citations
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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
Total-energy calculation of the magnetocrystalline anisotropy energy in the ferromagnetic 3d metals
TL;DR: It is demonstrated that total energy calculations based upon only the local density approximation of density functional theory in combination with an orbital polarization correction can be used to derive total energy values in the discrete-time regime.
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Preparation and magnetic property of Fe nanowire array
TL;DR: In this article, Fe was electrodeposited into the holes of porous anodic aluminium oxide (AAO) which was prepared electrochemically, and X-ray diffraction (XRD) spectra illustrated that the deposited material was α-Fe.
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Fabrication and magnetic properties of ultrathin Fe nanowire arrays
TL;DR: In this paper, the authors showed that the field needed to saturate the magnetization, when applied perpendicularly to the easy axis, was much larger than the shape anisotropy field (2πM S ).
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Magnetic anisotropy and magnetostriction in tetragonal and cubic ni
TL;DR: In this paper, the magnetic anisotropy energy (MAE) of face-centered-tetragonal (fct) Ni is calculated as a function of the axial c/a ratio.
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Perpendicular magnetocrystalline anisotropy in tetragonally distorted Fe-Co alloys
Gabriella Andersson,Till Burkert,Peter Warnicke,Matts Björck,Biplab Sanyal,Cyril Chacon,Claudia Zlotea,Lars Nordström,Per Nordblad,Olle Eriksson +9 more
TL;DR: The experimental realization of tetragonal Fe-Co alloys as a constituent of Fe0.36Co0.64/Pt superlattices with huge perpendicular magnetocrystalline anisotropy energy and a saturation magnetization at 40 K suggests that Fe- Co alloys with carefully chosen combinations of composition and distortion are good candidates for high-density perpendicular storage materials.