Nonlinear Spin Dynamics in Magnetic Mesostructures Induced by Spin Polarized Autoemission

2010 ◽  
Vol 168-169 ◽  
pp. 61-64
Author(s):  
Maksim Chinenkov ◽  
A.F. Popkov ◽  
V.I. Korneev ◽  
N.A. Mazurkin ◽  
N.A. Dyuzhev
Keyword(s):  
Magnetic Field ◽  
Dynamical System ◽  
External Magnetic Field ◽  
Spin Transport ◽  
Spin Dynamics ◽  
Spin Torque ◽  
Magnetic Structures ◽  
Spin Torque Transfer ◽  
Mesoscopic Structure ◽  
Spin Polarized

The work is devoted to the discussion of magnetic dynamics features in mesoscopic magnetic structures under the action of spin transport and spin-torque transfer in the nanopillar structures. Tunneling magnetic structure consisting of autoemission cathode and patterned magnetic anode is considered. Main bifurcation changes in the states of a dynamical system, that models mesoscopic structure, are discussed for varied spin polarized current and an external magnetic field.

scholarly journals Spin transport and spin dynamics in antiferromagnets

2021 ◽  
Author(s):  
◽  
Geert Hoogeboom
Keyword(s):  
Magnetic Field ◽  
Heavy Metal ◽  
Spin Transport ◽  
Spin Dynamics ◽  
Magnetic Moments ◽  
Spin Current ◽  
Active Role ◽  
Metal Films ◽  
Alternating Direction ◽  
High Processing

Ferromagnets (FMs) have been a key ingredient in information technology because it is easy to manipulate and read out the magnetization. Antiferromagnets (AFMs) have magnetic moments with alternating direction resulting in negligible magnetization. This gives them high processing and device downscaling features, but this also makes it challenging to manipulate and interact with the AFM order. This thesis studies this interaction with antiferromagnets. NiO AFM order has been read out by electrically injecting spin current via the spin Hall effect in thin heavy metal films. In DyFeO3, both Dy and Fe magnetic moments, their excitation and interaction have been probed. A magnetic field lifts the degeneracy of magnetic excitations with opposite magnon spin, allowing a spin current to be detected nonlocally. The AFM order and the generation of spin current can easily be controlled by an adjacent FM. Thereby, we show that AFMs have the potential to play an active role in spintronics.

The Behavior of the Ferromagnet/Wide-Band Polymer Heterostructure in Magnetic Field

2012 ◽  
Vol 190 ◽  
pp. 149-152 ◽  
Author(s):  
Natalya V. Vorob’eva ◽  
Aleksei N. Lachinov ◽  
V.M. Kornilov
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Polymer Film ◽  
Spin Transport ◽  
Wide Band ◽  
Experimental Results ◽  
Spin Polarized ◽  
Conductive State

The experimental results for huge magnetoresistance in polymer/ferromagnet system have been considered. The evidences have been established for the relation of the partially spin-polarized current in the structure and the magnetoresistance events. The model of charge and spin transport of the high-conductive state of wide-band polymer film/ferromagnet heterostructure have been proposed on the base of the experimental data totality.

Multilevel Spin Dynamics in Time-Dependent External Magnetic Field

2006 ◽  
Vol 26 (1-2) ◽  
pp. 47-54
Author(s):  
Péter Földi ◽  
Mihály G. Benedict ◽  
Francois M. Peeters
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Spin Dynamics ◽  
Time Dependent

Bifurcations in the Dynamical System for Three-Layered Magnetic Valve

2015 ◽  
Vol 233-234 ◽  
pp. 431-434 ◽  
Author(s):  
Natalia Ostrovskaya ◽  
Vladimir Skidanov ◽  
Iuliia Iusipova
Keyword(s):  
Magnetic Field ◽  
Dynamical System ◽  
Nonlinear Dynamical System ◽  
Anisotropy Field ◽  
Anisotropy Axis ◽  
Magnetization Dynamics ◽  
Nonlinear Dynamical ◽  
Demagnetizing Field ◽  
Spin Polarized ◽  
Space Dependence

Magnetization dynamics in a three-layered nanopillar Co/Cu/Co structure with one fixed and one free layer driven by external magnetic field and spin-polarized electric current was investigated using methods of the theory of bifurcations. Mathematical model is based on the Landau-Lifshits-Gilbert equation with the current term in the Sloncžewski–Berger form. Orientation of applied magnetic field was considered to be parallel to the anisotropy axis. Physical model included the magnetocrystalline anisotropy field and the demagnetizing field. Because of small size of the structure, the space dependence of magnetization, as usually, was not taken into account. The resulting system of equations has the form of the nonlinear dynamical system with the polynomial right sides. Mathematical simulation of magnetization dynamics for several typical values of field and current was performed. The numerical experiments revealed the features of switching process in more detail and permitted to find new regimes of magnetization dynamics, such as incomplete and accidental switching.

Manipulation of Spin Dynamics in Semiconductor Structures by Orientation of Small External Magnetic Field

2011 ◽  
Author(s):  
K. L. Litvinenko ◽  
M. A. Leontiadou ◽  
Juerong Li ◽  
E. T. Bowyer ◽  
S. K. Clowes ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Spin Dynamics ◽  
Semiconductor Structures

scholarly journals Self-assembly of smallest magnetic particles

2015 ◽  
Vol 112 (47) ◽  
pp. 14484-14489 ◽  
Author(s):  
Sara Mehdizadeh Taheri ◽  
Maria Michaelis ◽  
Thomas Friedrich ◽  
Beate Förster ◽  
Markus Drechsler ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Data Storage ◽  
Self Assembly ◽  
Magnetic Particles ◽  
Dipole Interaction ◽  
The Self ◽  
Magnetic Structures ◽  
Medical Technologies ◽  
1D Chains

The assembly of tiny magnetic particles in external magnetic fields is important for many applications ranging from data storage to medical technologies. The development of ever smaller magnetic structures is restricted by a size limit, where the particles are just barely magnetic. For such particles we report the discovery of a kind of solution assembly hitherto unobserved, to our knowledge. The fact that the assembly occurs in solution is very relevant for applications, where magnetic nanoparticles are either solution-processed or are used in liquid biological environments. Induced by an external magnetic field, nanocubes spontaneously assemble into 1D chains, 2D monolayer sheets, and large 3D cuboids with almost perfect internal ordering. The self-assembly of the nanocubes can be elucidated considering the dipole–dipole interaction of small superparamagnetic particles. Complex 3D geometrical arrangements of the nanodipoles are obtained under the assumption that the orientation of magnetization is freely adjustable within the superlattice and tends to minimize the binding energy. On that basis the magnetic moment of the cuboids can be explained.

Magnetic structures in ultra-thin Holmium films: Influence of external magnetic field

2015 ◽  
Vol 377 ◽  
pp. 24-28 ◽  
Author(s):  
L.J. Rodrigues ◽  
V.D. Mello ◽  
D.H.A.L. Anselmo ◽  
M.S. Vasconcelos
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Magnetic Structures
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