scholarly journals Anatomy of inertial magnons in ferromagnetic nanostructures

2021 ◽  
Vol 104 (5) ◽  
Author(s):  
Alexey M. Lomonosov ◽  
Vasily V. Temnov ◽  
Jean-Eric Wegrowe
Keyword(s):  
Ferromagnetic Nanostructures

scholarly journals Perpendicular exchange bias in antiferromagnetic-ferromagnetic nanostructures

2004 ◽  
Vol 84 (18) ◽  
pp. 3696-3698 ◽  
Author(s):  
J. Sort ◽  
B. Dieny ◽  
M. Fraune ◽  
C. Koenig ◽  
F. Lunnebach ◽  
...  
Keyword(s):  
Exchange Bias ◽  
Ferromagnetic Nanostructures

scholarly journals Influence of long-range interactions on the switching behavior of particles in an array of ferromagnetic nanostructures

2014 ◽  
Vol 16 (8) ◽  
pp. 083012 ◽  
Author(s):  
Alexander Neumann ◽  
David Altwein ◽  
Carsten Thönnißen ◽  
Robert Wieser ◽  
Andreas Berger ◽  
...  
Keyword(s):  
Long Range ◽  
Switching Behavior ◽  
Ferromagnetic Nanostructures ◽  
Long Range Interactions

DIPOLE-EXCHANGE SPIN WAVES IN FERROMAGNETIC NANOSTRUCTURES WITH SPHERICAL GEOMETRIES

2008 ◽  
Vol 15 (06) ◽  
pp. 727-744 ◽  
Author(s):  
HOA T. NGUYEN ◽  
M. G. COTTAM
Keyword(s):  
Function Theory ◽  
Spin Waves ◽  
Microscopic Theory ◽  
Particle Sizes ◽  
Spin Hamiltonian ◽  
Spherical Shells ◽  
Dipole Interactions ◽  
Ferromagnetic Nanostructures ◽  
Dipole Exchange ◽  
Spectral Intensities

Dipole–exchange spin waves (SWs) are studied in ferromagnetic nanostructures with spherical geometries such as spheres, part spheres, and spherical shells, both individually and in finite-sized arrays. A microscopic theory is used based on a spin Hamiltonian, which incorporates the short-range exchange and long-range magnetic dipole–dipole interactions, as well as an external magnetic field applied in any direction. Our theory is advantageous for describing the dynamical properties of inhomogeneously magnetized samples, and the use of phenomenological boundary conditions is avoided. Numerical results are deduced for the frequencies of the discrete SW modes and their dependence on the radius, spacing between particles, applied field, etc. Applications are made to Permalloy Fe 19 Ni 81 and alloy Co 80 Ni 20 nanoparticles with their sizes varying from 10 to 100 nm. Through a Green function theory, the spatial distributions and spectral intensities of the SWs are also deduced. The mode-mixing (hybridization) effects on the SW branches are found to be important, depending on the particle sizes and geometries.

scholarly journals Spin-wave Instability Theory for Ferromagnetic Nanostructures

2015 ◽  
Vol 127 (2) ◽  
pp. 192-197
Author(s):  
Z. Haghshenasfard ◽  
H.T. Nguyen ◽  
M.G. Cottam
Keyword(s):  
Spin Wave ◽  
Wave Instability ◽  
Instability Theory ◽  
Ferromagnetic Nanostructures

Microwave Properties of Ferromagnetic Nanostructures

2008 ◽  
Vol 8 (6) ◽  
pp. 2827-2835 ◽  
Author(s):  
R. Valenzuela ◽  
G. Alvarez ◽  
M. E. Mata-Zamora
Keyword(s):  
Microwave Absorption ◽  
High Frequency ◽  
Dynamic Properties ◽  
Nanowire Arrays ◽  
Giant Magnetoimpedance ◽  
Microwave Frequencies ◽  
Low Field ◽  
Ferromagnetic Nanostructures ◽  
Made In ◽  
Absorption Mode

A review of the dynamic properties of nanostructured ferromagnetic materials at microwave frequencies (1–40 GHz) is presented. Since some confusion has recently appeared between giant magnetoimpedance (GMI) and ferromagnetic resonance (FMR), a detailed analysis is made in order to establish their differences. A brief review of a novel microwave absorption mode, the low-field microwave absorption (LFA) is then presented, together with a discussion about its similarities with GMI. Recent results on high-frequency measurements on nanogranular thin films and FMR in nanowire arrays are finally addressed.

Magnetization processes in ferromagnetic nanostructures with competing anisotropies

2005 ◽  
Vol 290-291 ◽  
pp. 772-775 ◽  
Author(s):  
U.K. Rößler ◽  
S.V. Bukhtiyarova ◽  
I.V. Zhikharev ◽  
A.N. Bogdanov
Keyword(s):  
Ferromagnetic Nanostructures ◽  
Magnetization Processes

ChemInform Abstract: Microwave Properties of Ferromagnetic Nanostructures

ChemInform ◽  
2009 ◽  
Vol 40 (43) ◽  
Author(s):  
R. Valenzuela ◽  
G. Alvarez ◽  
M. E. Mata-Zamora
Keyword(s):  
Microwave Properties ◽  
Ferromagnetic Nanostructures
Sign in / Sign up

Export Citation Format

Share Document