Influence of magnetic field sweep rate on the hysteresis loops of Ni 0.8 Fe 0.2 /Fe 0.5 Mn 0.5 exchange bias bilayer

2006 ◽  
Vol 15 (2) ◽  
pp. 449-453 ◽  
Author(s):  
He Ke
Keyword(s):  
Magnetic Field ◽  
Exchange Bias ◽  
Hysteresis Loops ◽  
Sweep Rate ◽  
Field Sweep

scholarly journals Effect of Magnetic Field and Temperature on the Exchange Bias in Phase-Separated Nd1-xSrxCoO3(x=0.10, 0.15)

2015 ◽  
Vol 9 (1) ◽  
pp. 56-59 ◽  
Author(s):  
Yi-Yun Yang
Keyword(s):  
Magnetic Field ◽  
Exchange Bias ◽  
Exchange Coupling ◽  
Hysteresis Loops ◽  
Freezing Temperature ◽  
Solid State Reaction Method ◽  
Conventional Solid State Reaction ◽  
Magnetic Field Axis ◽  
Coexisting Phases ◽  
The Magnetic Field

The exchange bias phenomena of phase-separated Nd1-xSrxCoO3(x=0.10, 0.15) samples were systematically investigated in this paper. The samples were prepared using conventional solid state reaction method. When the NdSrCoO samples cooled down in magnetic field below freezing temperature, the hysteresis loops shifted along the magnetic field axis. Moreover, exchange bias of Nd1-xSrxCoO3 is strongly dependent on the field and the temperature. The influence of magnetic field on the relative ratio of the coexisting phases may be responsible for these behaviors. Therefore, our study confirmed that in phase-separated system, the exchange coupling at the interface between the ferromagnetism clusters and the spin glass regions may induce interfacial exchange anisotropy.

Oscillatory Angular Dependence of Exchange Bias for Epitaxial NiO-Co (001) Bilayers

2001 ◽  
Vol 674 ◽  
Author(s):  
S. Dubourg ◽  
J.F. Bobo ◽  
B. Warot ◽  
E. Snoeck ◽  
J.C. Ousset
Keyword(s):  
Magnetic Field ◽  
Exchange Bias ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Field Application ◽  
Zero Field ◽  
Sign Change ◽  
Realistic Description ◽  
Sputter Deposited ◽  
The Magnetic Field

ABSTRACTWe have sputter-deposited NiO-Co bilayers on MgO (001) substrates. NiO grows epitaxially on MgO at 900°C and subsequently the room deposited 80 Åthick Co films have a fcc crystal structure in epitaxy with the oxide underlayer. These samples were warmed up to 300° C and then zero-field or field cooled through the NiO Néel temperature (a 300 Oe magnetic field was applied along the [100] or the [110] MgO axis). Magnetic hysteresis loops were obtained by magneto-optical Kerr effect, the magnetic field being oriented in the plane of the substrate for various angles α with respect to the [100] direction. The usually expected behavior for such experiments is a smooth angular α dependence of the exchange bias HE close to a cosine with only one sign change over 180°. The high crystallographic coherence of our NiO/Co bilayers induces a very unusual oscillatory HE (α) dependence with several sign changes according to the NiO axis field application. Despite of the Co magnetization switching mechanism which is not a pure coherent rotation, we propose a Stoner-Wohlfhart model including four fold anisotropy and unidirectional exchange anisotropy giving a realistic description of these typical magnetic properties.

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

1997 ◽  
Vol 251 (1-2) ◽  
pp. 150-155 ◽  
Author(s):  
K. Frikach ◽  
S. Senoussi ◽  
A. Taoufik ◽  
M. Boudissa
Keyword(s):  
Magnetic Field ◽  
Thin Film ◽  
Sweep Rate ◽  
Flux Creep ◽  
Field Sweep ◽  
The Magnetic Field

Influence of the magnetic field sweep rate on flux creep in melt textured sample of YBa2Cu3O7−d

1997 ◽  
Vol 282-287 ◽  
pp. 2263-2264 ◽  
Author(s):  
K. Frikach ◽  
A. Taoufik ◽  
M. Boudissa ◽  
S. Senoussi ◽  
R. Halimi
Keyword(s):  
Magnetic Field ◽  
Sweep Rate ◽  
Flux Creep ◽  
Field Sweep ◽  
The Magnetic Field

Magnetic field sweep rate influence on the critical current capabilities of a Fe(Se,Te) crystal

2020 ◽  
Vol 128 (7) ◽  
pp. 073902
Author(s):  
A. Galluzzi ◽  
K. Buchkov ◽  
E. Nazarova ◽  
V. Tomov ◽  
A. Leo ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Critical Current ◽  
Sweep Rate ◽  
Field Sweep

Dynamics of Magnetization in Frustrated Spin-Chain Systems: Ca3Co2O6

2009 ◽  
Vol 152-153 ◽  
pp. 225-228 ◽  
Author(s):  
Alexander Korshunov ◽  
Yu. B. Kudasov ◽  
Dmitry Andreevich Maslov ◽  
V. Pavlov
Keyword(s):  
Magnetic Field ◽  
Spin Chain ◽  
Sweep Rate ◽  
Two Dimensional ◽  
Heat Reservoir ◽  
Field Sweep ◽  
Single Spin ◽  
Nearest Neighbours ◽  
Frustrated Spin ◽  
The Magnetic Field

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.

Sweep-Rate Dependent Reversal of Magnetic Moment in Superconducting Films

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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