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The magnetization M(H) has been measured in the weakly helimagnetic itinerant compound MnSi under high pressure up to 10.2 kbar and high magnetic field up to 9 Tesla. We interpret the simultaneous decrease under pressure of the saturated…

Strongly Correlated Electrons · Physics 2009-10-31 C. Thessieu , K. Kamishima , T. Goto , G. Lapertot

The combined effect of nonmagnetic and magnetic defects and impurities on critical temperatures of superconductors with different gap anisotropy is studied theoretically within the weak coupling limit of the BCS model. An expression is…

Superconductivity · Physics 2009-10-30 Leonid A. Openov

Local magnetic moments in disordered sytems can be described in terms of annealed magnetic disorder, in addition to the underlying quenched disorder. It is shown that for noninteracting electron systems at zero temperature, the annealed…

Statistical Mechanics · Physics 2009-10-31 D. Belitz , T. R. Kirkpatrick , Thomas Vojta

Multiple relaxation times detected in the ac magnetic susceptibility of several single-molecule magnets have been always assigned to extrinsic factors, such as nonequivalent magnetic centers or effects of intermolecular interactions in the…

Materials Science · Physics 2016-10-12 Le Tuan Anh Ho , Liviu F. Chibotaru

High-temperature superconductors (HTS) are finding use as high - current wires for potential application in power devices. The dependence of their basal-plane critical current properties on orientation in a magnetic field can pose important…

Superconductivity · Physics 2009-11-13 Y. L. Zuev , D. K. Christen , S. H. Wee , A. Goyal , S. W. Cook

A superconductor is influenced by an applied magnetic field. Close to the transition temperature $T_{c}$ fluctuations dominate and the correlation length $\xi $ increases strongly when $T_{c}$ is approached. However, for nonzero magnetic…

Superconductivity · Physics 2007-05-23 T. Schneider

We have proposed a systematic theoretic framework to calculate the trapped magnetic field and temperature distributions in a superconducting disk (SD) magnetized by a field-cooling process. Our calculations are based on the critical state…

Superconductivity · Physics 2007-05-23 Y. Hou , C. Y. He , L. Liu , Z. X. Gao

We investigate heavy-hole spin relaxation and decoherence in quantum dots in perpendicular magnetic fields. We show that at low temperatures the spin decoherence time is two times longer than the spin relaxation time. We find that the spin…

Mesoscale and Nanoscale Physics · Physics 2007-05-23 Denis V. Bulaev , Daniel Loss

We investigate the spin dynamics of electrons in quantum wells where the Rashba type of spin-orbit coupling is present in the form of random nanosize domains. We study the effect of magnetic field on the spin relaxation in these systems and…

Mesoscale and Nanoscale Physics · Physics 2009-11-11 M. M. Glazov , E. Ya. Sherman

A trapped magnetic field of greater than 3 T has been achieved in a single grain GdBa2Cu3O7-{\delta} (GdBaCuO) bulk superconductor of diameter 30 mm by employing pulsed field magnetisation (PFM). The magnet system is portable and operates…

Magnetization reversal in permanent magnets occurs by the nucleation and expansion of reversed domains. Micromagnetic theory offers the possibility to localize the spots within the complex structure of the magnet where magnetization…

Materials Science · Physics 2018-05-25 J. Fischbacher , A. Kovacs , L. Exl J. Kühnel , E. Mehofer , H. Sepehri-Amin , T. Ohkubo , K. Hono , T. Schrefl

We present a two-current-pulse temporal correlation experiment to study the intrinsic subnanosecond nonequilibrium magnetic dynamics of a nanomagnet during and following a pulse excitation. This method is applied to a model spin-transfer…

Mesoscale and Nanoscale Physics · Physics 2012-06-25 H. Liu , D. Bedau , J. Z. Sun , S. Mangin , E. E. Fullerton , J. A. Katine , A. D. Kent

The nonaxisymmetric magnetohydrodynamic (MHD) modes in a zero-beta cylindrical compressible thin magnetic flux tube modelled as a twisted core surrounded by a magnetically twisted annulus, both embedded in a straight ambient external field…

Solar and Stellar Astrophysics · Physics 2012-09-18 K. Karami , K. Bahari

In weakly magnetized, dilute plasmas in which thermal conduction along magnetic field lines is important, the usual convective stability criterion is modified. Instead of depending on entropy gradients, instability occurs for small…

Astrophysics · Physics 2009-11-13 Ian J. Parrish , James M. Stone

The magnetic moment of an electron gas on the surface of constant negative curvature is investigated. It is shown that the surface curvature leads to the appearance of the region of the monotonic dependence $M(B)$ at low magnetic fields. At…

Mesoscale and Nanoscale Physics · Physics 2009-11-10 D. V. Bulaev , V. A. Margulis

The low temperature relaxation of the magnetization in magnetic molecular solids such as Fe$_8$ is studied using Monte Carlo simulations. A set of rate equations is developed to understand the simulations, and the results are compared. The…

Statistical Mechanics · Physics 2015-10-14 Avinash Vijayaraghavan , Anupam Garg

The dependence of the ultrasonic attenuation on the direction of magnetic field in an intermediate state of the very pure Gallium single crystal, in the case, when the magnetic field H is perpendicular to the wave vector k at the…

Superconductivity · Physics 2012-10-08 Anatoly G. Shepelev , Oleg P. Ledenyov , Genady D. Filimonov

We investigate electron transport and phase-breaking processes in thin titanium nitride (TiN) films of epitaxial quality. Previous studies show that a minute surface magnetic disorder significantly reduces the critical temperature…

We present numerical and analytical results for the swiching times of magnetic nanoparticles with uniaxial anisotropy at elevated temperatures, including the vicinity of T_c. The consideration is based in the Landau-Lifshitz-Bloch equation…

Statistical Mechanics · Physics 2007-05-23 D. A. Garanin , O. Chubykalo-Fesenko

Precise magnetic hysteresis measurements of small single crystals of Mn$_{12}$ acetate of spin 10 have been conducted down to 0.4 K using a high sensitivity Hall magnetometer. At higher temperature (>1.6K) step-like changes in magnetization…

Mesoscale and Nanoscale Physics · Physics 2009-10-31 Andrew D. Kent , Yicheng Zhong , Louisa Bokacheva , Daniel Ruiz , David N. Hendrickson , M. P. Sarachik