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Determination of Intrinsic Magnetic Response from Local Measurements of Fringing Fields
Bo Wen, Andrew J. Millis, Enric Pardo +4
Micron-sized Hall bars and micro-SQUIDs are now used routinely to measure the local static and dynamic magnetic response with micron-scale spatial resolution. While this provides a…
Quantum Fluctuations and Long-Range Order in Molecular Magnets
P. Subedi, Bo Wen, Y. Yeshurun +3
We review our studies of the effect of transverse fields on the susceptibility and magnetization of single crystals of the prototype single molecule magnet (SMM), Mn-acetate…
Magnetic Avalanches in Molecular Magnets
Myriam P. Sarachik
The reversal of the magnetization of crystals of molecular magnets that have a large spin and high anisotropy barrier generally proceeds below the blocking temperature by quantum t…
Onset of a Propagating Self-Sustained Spin Reversal Front in a Magnetic System
P. Subedi, S. Vélez, F. Macià +6
The energy released in a magnetic material by reversing spins as they relax toward equilibrium can lead to a dynamical instability that ignites self-sustained rapid relaxation alon…
Magnetic Avalanches in Molecular Nanomagnets
M. P. Sarachik, S. McHugh
The magnetization of the prototypical molecular magnet Mn12-acetate exhibits a series of sharp steps at low temperatures due to quantum tunneling at specific resonant values of mag…
Single-molecule Nanomagnets
Jonathan R. Friedman, Myriam P. Sarachik
Single molecule magnets straddle the classical and quantum mechanical worlds, displaying many fascinating phenomena. They may have important technological applications in informati…
Pure and Random-Field Quantum Criticality in the Dipolar Ising Model: Theory of acetates
A. J. Millis, A. D. Kent, M. P. Sarachik +1
A theoretical model for the acetates is derived including a 'random field' effect arising from isomer effects in some families of host acetate materials. Estimates for th…
Realization of random-field dipolar Ising ferromagnetism in a molecular magnet
Bo Wen, P. Subedi, Lin Bo +5
The longitudinal magnetic susceptibility of single crystals of the molecular magnet Mn-acetate obeys a Curie-Weiss law, indicating a transition to a ferromagnetic phase due…
Ignition and Propagation of Magnetic Avalanches in Mn-Acetate: the effect of quantum tunneling
S. McHugh, R. Jaafar, M. P. Sarachik +6
Using a wire heater to ignite magnetic avalanches in fixed magnetic field applied along the easy axis of single crystals of the molecular magnet Mn-acetate, we report fast l…
Local Measurements of Magnetization in Mn12 Crystals
Nurit Avraham, Ady Stern, Yoko Suzuki +9
The spatial profile of the magnetization of Mn12 crystals in a swept magnetic field applied along the easy axis is determined from measurements of the local magnetic induction alon…
More Evidence for a Distribution of Tunnel Splittings in Mn-acetate
K. M. Mertes, Yoko Suzuki, M. P. Sarachik +6
In magnetic fields applied parallel to the anisotropy axis, the magnetization of Mn has been measured in response to a field that is swept back and forth across the resonanc…
Microwave Rectification at the Boundary between Two-Dimensional Electron Systems
I. Hoxha, S. A. Vitkalov, N. A. Zimbovskaya +2
Rectification of microwave radiation (20-40 GHz) by a line boundary between two two-dimensional metals on a silicon surface was observed and investigated at different temperatures,…
Abrupt Transition between Thermally-Activated Relaxation and Quantum Tunneling in a Molecular Magnet
K. M. Mertes, Y. Zhong, M. P. Sarachik +5
We report Hall sensor measurements of the magnetic relaxation of Mn acetate as a function of magnetic field applied along the easy axis of magnetization. Data taken at a ser…
Low temperature magnetic hysteresis in Mn acetate single crystals
Andrew D. Kent, Yicheng Zhong, Louisa Bokacheva +3
Precise magnetic hysteresis measurements of small single crystals of Mn acetate of spin 10 have been conducted down to 0.4 K using a high sensitivity Hall magnetometer. At h…
Resonant Magnetization Tunneling in Mn12 Acetate: The Absence of Inhomogeneous Hyperfine Broadening
Jonathan R. Friedman, M. P. Sarachik, R. Ziolo
We present the results of a detailed study of the thermally-assisted-resonant-tunneling relaxation rate of Mn12 acetate as a function of an external, longitudinal magnetic field an…
Reflection symmetry at a B=0 metal-insulator transition in two dimensions
D. Simonian, S. V. Kravchenko, M. P. Sarachik
We report a remarkable symmetry between the resistivity and conductivity on opposite sides of the B=0 metal-insulator transition in a two-dimensional electron gas in high-mobility…