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Neutron spectroscopic study of crystal-field excitations and the effect of the crystal field on dipolar magnetism in LiRF4 (R = Gd, Ho, Er, Tm, and Yb)
We present a systematic study of the crystal-field interactions in the LiRF4 (R = Gd, Ho, Er, Tm, and Yb) family of rare-earth magnets. Using detailed inelastic neutron scattering measurements, we…
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Spin-torque switching and control using chirped AC currents
We propose to use oscillating spin currents with slowly varying frequency (chirp) to manipulate and control the magnetization dynamics in a nanomagnet. By recasting the Landau–Lifshitz–Slonczewski…
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Autoresonant control of the magnetization switching in single-domain nanoparticles
The ability to control the magnetization switching in nanoscale devices is a crucial step for the development of fast and reliable techniques to store and process information. Here we show that the…
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Autoresonant switching of the magnetization in single-domain nanoparticles: Two-level theory
The magnetic moment of a single-domain nanoparticle can be effectively switched on an ultrashort time scale by means of oscillating (microwave) magnetic fields. This switching technique can be…
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Effect of Disorder and Dipolar Interactions in Two-Dimensional Assemblies of Iron-Oxide Magnetic Nanoparticles
We examine the magnetic properties of two-dimensional monolayers of iron-oxide magnetic nanoparticles arranged on a hexagonal lattice and interacting through magnetic dipole forces. Monte Carlo…
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Simulated annealing study of the disordered quantum magnet LiHoxEryY1-x-yF4
Thermal and quantum phase transitions of some rare earth compounds (LiErF4, LiYbF4, LiGdF4 and LiTmF4) are established using the mean field theory. These preliminary calculations allowed evidencing…
O ct 2 01 5 Neutron spectroscopic study of crystal-field excitations and the effect of the crystal field on dipolar magnetism in
P. Babkevich, ∗ A. Finco, 2 M. Jeong, B. Dalla Piazza, I. Kovacevic, G. Klughertz, 3 K. W. Krämer, C. Kraemer, D. T. Adroja, E. Goremychkin, T. Unruh, 7 T. Strässle, A. Di Lieto, 10 J. Jensen, and H.…
Magnetization Reversal in a Cobalt Nanoparticle
We study the magnetization reversal of isolated and interacting single-domain cobalt nanoparticles with uniaxial anisotropy under the macrospin approximation. We analyze the consequences of dipolar…
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