scholarly journals Implementation of the “Hyperdynamics of Infrequent Events” Method for Acceleration of Thermal Switching Dynamics of Magnetic Moments

2004 ◽  
Vol 40 (4) ◽  
pp. 2140-2142 ◽  
Author(s):  
O.A. Chubykalo-Fesenko ◽  
F.G. Sanchez ◽  
R.W. Chantrell
Keyword(s):  
Magnetic Moments ◽  
Switching Dynamics ◽  
Thermal Switching

scholarly journals Магнитоэлектроакустическая динамика в стрейнтронной ячейке памяти с произвольным доступом

2020 ◽  
Vol 46 (1) ◽  
pp. 43
Author(s):  
В.Л. Преображенский ◽  
Л.М. Крутянский ◽  
N. Tiercelin ◽  
P. Pernod
Keyword(s):  
Magnetic Moments ◽  
Random Access ◽  
Oscillation Period ◽  
Acoustic Oscillations ◽  
Storage Devices ◽  
Magnetic Switching ◽  
Switching Dynamics ◽  
Recording Process ◽  
Magnetic States ◽  
Acoustic Excitations

Straintronic principle of nonvolatile magnetoelectric random access memory (MELRAM) draws much attention due to the prospects of ultra-low energy consumption in storage devices. The switching of magnetic moments by pulsed deformation of elastically coupled magnetic and piezoelectric subsystems is accompanied by excitation of acoustic oscillations in the memory cells. Oscillation period in nanoscale cells is comparable with the magnetic moment switching time, which can affect the information recording process. In the present paper the influence of acoustic excitations on the magnetic switching dynamics is studied by numerical modeling with application to a magnetostrictive cell 50×50×400 nm3 on a PMN-PT <011> substrate. Parameters of voltage control pulses that can insure reliable switching of magnetic states of the system are determined.

Micromagnetic Modeling for a Study of Spin Transfer Torque in Ferromagnetic Materials

2015 ◽  
Vol 781 ◽  
pp. 219-222
Author(s):  
Samutchar Coomkeaw ◽  
Badin Damrongsak
Keyword(s):  
Magnetic Moments ◽  
Dynamical Behavior ◽  
Spin Current ◽  
Random Access ◽  
Thermal Fluctuations ◽  
Ferromagnetic Materials ◽  
Effective Field ◽  
Spin Transfer Torque ◽  
Spin Transfer ◽  
Switching Dynamics

We have developed a numerical model for investigating a motion of magnetic moments in ferromagnetic materials with spin transfer torque (STT). The model can be used to provide a basic understanding of the switching dynamics and can be used as a tool to design and develop magnetic random access memories (MRAM). The relevant equation used in this work was the Landau-Lifshitz-Gilbert (LLG) equation with the additional STT term. The equation was used to describe the dynamical behavior of a magnetization which is exposed to an applied spin current and an effective field. The effects of thermal fluctuations on the motion of magnetic moments were excluded. The model was implemented in MATLABTM using a finite difference method (FDM). The program was verified with two-spin system and standard problems. Simulation results were also compared with those obtained from OOMMF.

SWITCHING DYNAMICS OF BISTABLE CdS ABSORPTIVE PLATELETS

1988 ◽  
Vol 49 (C2) ◽  
pp. C2-153-C2-156 ◽  
Author(s):  
J.-Y. BIGOT ◽  
A. DAUNOIS ◽  
N. CHERKAOUI EDDEQAQI ◽  
J. OBERLE ◽  
M. WEGENER ◽  
...  
Keyword(s):  
Switching Dynamics

The effect of Tin additionon on Structural and magnetic properties of the stannoferrite Li0.5+0.5XFe2.5-1.5XSnXO4

2016 ◽  
Vol 12 (3) ◽  
pp. 4307-4321 ◽  
Author(s):  
Ahmed Hassan Ibrahim ◽  
Yehia Abbas
Keyword(s):  
Particle Size ◽  
Fine Particles ◽  
Magnetic Moments ◽  
Lithium Ferrite ◽  
Tem Analysis ◽  
Weiss Temperature ◽  
X Ray ◽  
Two Phases ◽  
Nanocrystalline Ferrite ◽  
20 Nm

The physical properties of ferrites are verysensitive to microstructure, which in turn critically dependson the manufacturing process.Nanocrystalline Lithium Stannoferrite system Li0.5+0.5XFe2.5-1.5XSnXO4,X= (0, 0.2, 0.4, 0.6, 0.8 and 1.0) fine particles were successfully prepared by double sintering ceramic technique at pre-sintering temperature of 500oC for 3 h andthepre-sintered material was crushed and sintered finally in air at 1000oC.The structural and microstructural evolutions of the nanophase have been studied using X-ray powder diffraction (XRD) and the Rietveld method.The refinement results showed that the nanocrystalline ferrite has a two phases of ordered and disordered phases for polymorphous lithium Stannoferrite.The particle size of as obtained samples were found to be ~20 nm through TEM that increases up to ~ 85 nmand isdependent on the annealing temperature. TEM micrograph reveals that the grains of sample are spherical in shape. (TEM) analysis confirmed the X-ray results.The particle size of stannic substituted lithium ferrite fine particle obtained from the XRD using Scherrer equation.Magneticmeasurements obtained from lake shore’s vibrating sample magnetometer (VSM), saturation magnetization ofordered LiFe5O8 was found to be (57.829 emu/g) which was lower than disordered LiFe5O8(62.848 emu/g).Theinterplay between superexchange interactions of Fe3+ ions at A and B sublattices gives rise to ferrimagnetic ordering of magnetic moments,with a high Curie-Weiss temperature (TCW ~ 900 K).

Negative magnetoresistance in insulating CdSe and localized magnetic moments

2008 ◽  
Vol 33 (4) ◽  
pp. 351-356
Author(s):  
Rachid Abdia ◽  
Ablehamid El Kaaouachi ◽  
Abdelhakim Nafidi ◽  
Gérard Biskupski ◽  
Jamal Hemine
Keyword(s):  
Magnetic Moments ◽  
Negative Magnetoresistance

Coordination Compounds of Some 3d-Transition Metal Ions with N1-[4-(4-bromo-phenylsulfonyl)-benzoyl]-N4-(4-methoxyphenyl)- thiosemicarbazide

2008 ◽  
Vol 59 (7) ◽  
Author(s):  
Madalina Angelusiu ◽  
Maria Negoiu ◽  
Stefania-Felicia Barbuceanu ◽  
Tudor Rosu
Keyword(s):  
Coordination Compounds ◽  
Magnetic Moments ◽  
Thermo Gravimetric Analysis ◽  
Electronic Spectroscopy ◽  
Transition Metal Ions ◽  
Synthesis And Characterization ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
New Compounds

The paper presents the synthesis and characterization of Cu(II), Co(II), Ni(II), Cd(II), Zn(II) and Hg(II) complexes with N1-[4-(4-bromo-phenylsulfonyl)-benzoyl]-N4-(4-methoxyphenyl)-thiosemicarbazide. The new compounds were characterized by IR, EPR, electronic spectroscopy, magnetic moments, thermo-gravimetric analysis and elemental analysis.

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