120 citations · 576 across the 38 of their papers we have counts for
11 papers · 1 filter
Suhl Instabilities in Nanoscopic Spheroids
Jinho Lim, Anupam Garg, John B. Ketterson
We simulate the magnetization dynamics of a permalloy spheroid of nanoscopic size in zero external field, such that both dipolar and exchange interactions are important. Low excita…
Ferromagnetic resonance modes in the exchange dominated limit in cylinders of finite length
Jinho Lim, Anupam Garg, J. B. Ketterson
We analyze the magnetic mode structure of axially-magnetized, finite-length, nanoscopic cylinders in a regime where the exchange interaction dominates, along with simulations of th…
Low-Temperature Phonoemissive Tunneling Rates in Single Molecule Magnets
Yun Liu, Anupam Garg
Tunneling between the two lowest energy levels of single molecule magnets with Ising type anisotropy, accompanied by the emission or absorption of phonons, is considered. Quantitat…
Phonoemissive Spin Tunneling in Molecular Nanomagnets
Anupam Garg
A new mechanism is proposed for the magnetization reversal of molecular nanomagnets such as \Fe8. In this process the spin tunnels from the lowest state near one easy direction to…
Lost and found: The missing diabolical points in the Fe molecular magnet
Feifei Li, Anupam Garg
Certain diabolical points in the tunneling spectrum of the single-molecule magnet Fe were previously believed to be have been eliminated as a result of a weak fourth-order anis…
Bohr-Sommerfeld quantization of spin Hamiltonians
Anupam Garg, Michael Stone
The Bohr-Sommerfeld rule for a spin system is obtained, including the first quantum corrections. The rule applies to both integer and half-integer spin, and respects Kramers degene…
Large-field versus discontinuous instantons in spin orientation tunneling
Anupam Garg, Ersin Kececioglu
Tunnel splitting oscillations in magnetic molecules are reconsidered within the simplest model for the problem, which does not contain fourth order anisotropy. It is shown that at…
SU(2) instantons with boundary jumps and spin tunneling in magnetic molecules
Ersin Kececioglu, Anupam Garg
Coherent state path integrals are shown in general to contain instantons with jumps at the boundaries, i.e., with boundary points lying outside classical parameter or phase space.…
Spin tunnelling in Molecular Magnets
Anupam Garg
We study spin tunneling in magnetic molecules, with special reference to Fe8. The article aims to give a pedagogical discussion of what is meant by the tunneling of a spin, and how…
Spin tunnelling in mesoscopic systems
Anupam Garg
We study spin tunnelling in molecular magnets as an instance of a mesoscopic phenomenon, with special emphasis on the molecule Fe8. We show that the tunnel splitting between variou…
Topological Quenching of Spin Tunneling in Mn_12-acetate Molecules
Chang-Soo Park, Anupam Garg
We investigate the topological quenching of spin tunneling in Mn_12-acetate molecules with an applied magnetic field along the hard axis. The model Hamiltonian describing this syst…