Molecular Magnets: Physics and Applications by Javier Tejada (auth.), Juan Bartolomé, Fernando Luis, Julio

By Javier Tejada (auth.), Juan Bartolomé, Fernando Luis, Julio F. Fernández (eds.)

This booklet offers an summary of the actual phenomena chanced on in magnetic molecular fabrics over the past two decades. it's written via major scientists having made crucial contributions to this energetic quarter of analysis. the most issues of this ebook are the foundations of quantum tunneling and quantum coherence of single-molecule magnets (SMMs), phenomena which transcend the physics of person molecules, similar to the collective habit of arrays of SMMs, the physics of one-dimensional single–chain magnets and magnetism of SMMs grafted on substrates. the aptitude functions of those actual phenomena to classical and quantum details, conversation applied sciences, and the rising fields of molecular spintronics and magnetic refrigeration are under pressure. The ebook is written for graduate scholars, researchers and non-experts during this box of research.

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Molecular Magnets: Physics and Applications

This booklet offers an summary of the actual phenomena chanced on in magnetic molecular fabrics over the past twenty years. it truly is written via top scientists having made crucial contributions to this lively zone of study. the most themes of this booklet are the rules of quantum tunneling and quantum coherence of single-molecule magnets (SMMs), phenomena which transcend the physics of person molecules, reminiscent of the collective habit of arrays of SMMs, the physics of one-dimensional single–chain magnets and magnetism of SMMs grafted on substrates.

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Right: experimental and calculated variations of the crossover temperature Tco with the field tilt angle. In both cases, continuous lines are fits to the model of Ref. 1 Micro-SQUID Measurements The triggering factor for the realization of the micro-SQUID magnetometer was a short discussion with A. Benoit from our institute (CRTBT at the time) who had developed a challenging micro-SQUID set-up to detect the persistent currents of single non-superconducting loops [50]. ) would be much easier than detecting the persistent current of a normal mesoscopic loop.

For states such that m,n < ξm,n (HDMax ), molecules have a chance to tunnel if the applied field sweeps between 0 and ∼ HDMax . Under these conditions, the resonance line-width is of the order of HDMax . On the other hand, resonance line widths associated to tunneling via states having m,n > ξm,n (HDMax ) are, as this is well known, mainly determined by m,n eventually corrected by phonon broadenings (see, for instance, [58, 80, 81] and below). Experimentally, resonance lines for Mn12 have been obtained from either the plot of dMz /dHz vs.

Horizontal lines indicate the calculated crossing fields obtained from the energy level spectrum calculated from exact Hamiltonian diagonalisation (b). 8 K, the different loops merge showing that tunneling takes place from the ground-state m = 10 at fields larger than a few Tesla (above this temperature, as in Fig. 9, they merge only at lower fields, in agreement with the fact that Tco increases with decreasing H ). Similar results were obtained in the same set of experiments, but with a transverse field of about 4 T.

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