Influence of the magnetic field sweep rate on flux creep in highly textured thin film of YBa2Cu3O7−δ

A two-dimensional Ising-like model for the triangular spin-chain lattice, where each spin chain is treated as a rigid superspin, is proposed to investigate the dynamics of magnetization in frustrated triangular spin-chain systems. The superspins are assumed to interact with the nearest neighbours and external agency (heat reservoir and external magnetic field) that causes them to change their states randomly with time. A probability of a single spin-flip process is assumed in a Glauber-like form. This technique allows describing the steps in the magnetization curves observed in Ca3Co2O6 and their dependence on the magnetic field sweep rate and temperature.

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Sweep-Rate Dependent Reversal of Magnetic Moment in Superconducting Films

Modern Physics Letters B ◽

10.1142/s0217984903005664 ◽

2003 ◽

Vol 17 (10n12) ◽

pp. 635-647

Author(s):

P. Mikheenko ◽

M. S. Colclough ◽

R. Chakalov ◽

K. Kawano ◽

C. M. Muirhead

Keyword(s):

Magnetic Field ◽

Magnetic Moment ◽

Superconducting Films ◽

Sweep Rate ◽

Field Sweep ◽

Demagnetizing Field ◽

Colossal Magnetoresistive ◽

Rate Dependent ◽

Optical Evidence ◽

The Magnetic Field

We report on a dynamical effect in YBa 2 Cu 3 O x (YBCO) films and YBCO/CMR (Colossal Magnetoresistive) multilayers, in which variations in the magnetic field sweep rate can change, or reverse the sign of, the magnetic moment. The effect occurs in thin films having a low critical current density, either intrinsically or as a result of operation near the critical temperature. We attribute this effect to the large demagnetizing field present in the films, leading to a relaxation in the non-equilibrium vortex distribution, in which current near the edge of the film changes direction. We have investigated this effect in a variety of systems by magnetometery, and provide some magneto-optical evidence of its mechanism.

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Dependence of the coercive force on the magnetic field sweep rate in (PrDy)(FeCo)B alloys

Physics of the Solid State ◽

10.1134/s1063783417080121 ◽

2017 ◽

Vol 59 (8) ◽

pp. 1543-1546

Author(s):

E. I. Kunitsyna ◽

O. V. Koplak ◽

V. V. Kucheryaev ◽

D. V. Korolev ◽

V. P. Piskorskii ◽

...

Keyword(s):

Magnetic Field ◽

Coercive Force ◽

Sweep Rate ◽

Field Sweep ◽

The Magnetic Field

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Moving Pearl Vortices in Thin-Film Superconductors

Condensed Matter ◽

10.3390/condmat6010004 ◽

2021 ◽

Vol 6 (1) ◽

pp. 4

Author(s):

Vladimir Kogan ◽

Norio Nakagawa

Keyword(s):

Magnetic Field ◽

Thin Film ◽

Time Dependent ◽

Superconducting Thin Film ◽

Self Energy ◽

London Equation ◽

The Magnetic Field

The magnetic field hz of a moving Pearl vortex in a superconducting thin-film in (x,y) plane is studied with the help of the time-dependent London equation. It is found that for a vortex at the origin moving in +x direction, hz(x,y) is suppressed in front of the vortex, x>0, and enhanced behind (x<0). The distribution asymmetry is proportional to the velocity and to the conductivity of normal quasiparticles. The vortex self-energy and the interaction of two moving vortices are evaluated.

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Magnetic and magnetoresistive properties of nanocomposites based on Co and SiO

International Journal of Modern Physics B ◽

10.1142/s0217979219501133 ◽

2019 ◽

Vol 33 (12) ◽

pp. 1950113 ◽

Cited By ~ 2

Author(s):

I. M. Pazukha ◽

Y. O. Shkurdoda ◽

A. M. Chornous ◽

L. V. Dekhtyaruk

Keyword(s):

Magnetic Field ◽

Thin Film ◽

Magnetic Properties ◽

Room Temperature ◽

Annealing Process ◽

Anisotropic Character ◽

Co Concentration ◽

Beam Method ◽

The Magnetic Field ◽

Film Nanocomposites

A series of thin-film nanocomposites based on ferromagnetic metal Co and insulator SiO were prepared using an electron-beam method. The magnetoresistive and magnetic properties of these structures deposited at room temperature and then annealed to 700 K were investigated. The results showed that at the Co concentration 40 [Formula: see text]x [Formula: see text] 60 at.%, thin-film nanocomposites exhibit magnetoresistance (MR) that is conditional on spin-dependent tunnelling of electrons. This range of concentrations corresponds to the prepercolation area according to the magnetic investigations. For samples with x [Formula: see text] 70 at.%, the anisotropic character of MR peculiar to the homogeneous ferromagnetic materials appears. According to the magnetic properties study, this range of concentrations corresponds to the area after transition through the percolation threshold. The annealing process in temperature range from 300 K to 700 K in the magnetic field slightly influenced the magnetoresistive properties of the thin-film nanocomposites based on Co and SiO for all range of concentrations.

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Using electrochemical fabrication to grow external arrays of magnetic nanostripes to manipulate superconductivity in the thin film

International Journal of Modern Physics B ◽

10.1142/s0217979215420369 ◽

2015 ◽

Vol 29 (25n26) ◽

pp. 1542036

Author(s):

Wonbae Bang ◽

W. Teizer ◽

K. K. D. Rathnayaka ◽

I. F. Lyuksyutov ◽

D. G. Naugle

Keyword(s):

Magnetic Field ◽

Thin Film ◽

Transport Properties ◽

Electrochemical Fabrication ◽

The Magnetic Field

We present results on electrochemical fabrication of arrays of magnetic nanostripes atop a Sn film covered with an insulating Ge layer. We also report its transport properties and superconducting [Formula: see text]. The transport properties demonstrate strong hysteresis as a function of the magnetic field.

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