Large transverse field tunnel splittings in the Fe 8 spin Hamiltonian
نویسنده
چکیده
The spin Hamiltonian that describes the molecular magnet Fe8 has biaxial symmetry with mutually perpendicular easy, medium, and hard magnetic axes. Previous calculations of the ground state tunnel splittings in the presence of a magnetic field along the hard axis are extended, and the meaning of the previously discovered oscillation of this splitting is further clarified. 75.50.Xx, 75.45.+j, 03.65.Sq, 75.10.Dg c ©1999, The American Physical Society Typeset using REVTEX 1
منابع مشابه
ترابرد الکتریکی وابسته به اسپین در ساختارهای نامتجانس Fe-MgO-Fe
In this paper, spin-dependent electrical transport properties are investigated in a single-crystal magnetic tunnel junction (MTJ) which consists of two ferromagnetic Fe electrodes separated by an MgO insulating barrier. These properties contain electric current, spin polarization and tunnel magnetoresistance (TMR). For this purpose, spin-dependent Hamiltonian is described for Δ1 and Δ5 bands in...
متن کاملNon-Kramers degeneracy and oscillatory tunnel splittings in the biaxial Spin System
We have investigated analytically quantum tunneling of large spin in the biaxial spin system with the magnetic field applied along the hard and medium anisotropy axes by using a purely quantum-mechanical approach. When the magnetic field parallels the hard axis, the tunnel splittings of all the energy level pairs are oscillatory as a function of the magnetic field. The quenching points are comp...
متن کاملPrecision ESR measurements of transverse anisotropy in the single-molecule magnet Ni4
We present a method for precisely measuring the tunnel splitting in single-molecule magnets (SMMs) using electron-spin resonance, and use these measurements to precisely and independently determine the underlying transverse anisotropy parameter, given a certain class of transitions. By diluting samples of the SMM Ni4 via cocrystallization in a diamagnetic isostructural analog we obtain markedly...
متن کاملSimulating Frequency-Domain Electron Paramagnetic Resonance: Bridging the Gap between Experiment and Magnetic Parameters for High-Spin Transition-Metal Ion Complexes.
We present a comparison of experimental and simulated frequency- and field-domain electron paramagnetic resonance (EPR) spectra of integer and half-integer high-spin transition-metal ion complexes. For the simulation of EPR spectra a new tool within the EPR simulation software EasySpin is introduced, which allows for field- and frequency-domain EPR simulations with the same theoretical model an...
متن کاملQuenched Spin Tunneling and Diabolical Points in Magnetic Molecules: I. Symmetric Configurations
The perfect quenching of spin tunneling that has previously been discussed in terms of interfering instantons, and has recently been observed in the magnetic molecule Fe8, is treated using a discrete phase integral (or Wentzel-KramersBrillouin) method. The simplest model Hamiltonian for the phenomenon leads to a Schrödinger equation that is a five-term recursion relation. This recursion relatio...
متن کامل