scholarly journals Information processing in patterned magnetic nanostructures with edge spin waves

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Antonio Lara ◽  
Javier Robledo Moreno ◽  
Konstantin Y. Guslienko ◽  
Farkhad G. Aliev
Keyword(s):  
Information Processing ◽  
Spin Waves ◽  
Magnetic Nanostructures ◽  
Edge Spin

scholarly journals A new class of nonreciprocal spin waves on the edges of 2D antiferromagnetic honeycomb nanoribbons

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
D. Ghader ◽  
A. Khater
Keyword(s):  
Spin Waves ◽  
Experimental Studies ◽  
Classical Field Theory ◽  
Experimental Investigations ◽  
Theory Approach ◽  
Magnetic Excitations ◽  
Spintronic Devices ◽  
New Class ◽  
Potential Applications ◽  
Edge Spin

Abstract Antiferromagnetic two-dimensional (2D) materials are currently under intensive theoretical and experimental investigations in view of their potential applications in antiferromagnet-based magnonic and spintronic devices. Recent experimental studies revealed the importance of magnetic anisotropy and of Dzyaloshinskii-Moriya interactions (DMI) on the ordered ground state and the magnetic excitations in these materials. In this work we present a robust classical field theory approach to study the effects of anisotropy and the DMI on the edge and bulk spin waves in 2D antiferromagnetic nanoribbons. We predict the existence of a new class of nonreciprocal edge spin waves, characterized by opposite polarizations in counter-propagation. These novel edge spin waves are induced by the DMI and are fundamentally different from conventional nonreciprocal spin waves for which the polarization is independent of the propagation direction. We further analyze the effects of the edge structures on the magnetic excitations for these systems. In particular, we show that anisotropic bearded edge nanoribbons act as topologically trivial magnetic insulators with potentially interesting applications in magnonics. Our results constitute an important finding for current efforts seeking to establish unconventional magnonic devices utilizing spin wave polarization.

scholarly journals Observation of propagating edge spin waves modes

2013 ◽  
Vol 114 (21) ◽  
pp. 213905 ◽  
Author(s):  
A. Lara ◽  
V. Metlushko ◽  
F. G. Aliev
Keyword(s):  
Spin Waves ◽  
Edge Spin

scholarly journals Effect of the Interfacial Dzyaloshinskii–Moriya Interaction on the Spin Waves Eigenmodes of Isolated Stripes and Dots Magnetized In-Plane: A Micromagnetic Study

2021 ◽  
Vol 11 (7) ◽  
pp. 2929
Author(s):  
Raffaele Silvani ◽  
Michele Alunni ◽  
Silvia Tacchi ◽  
Giovanni Carlotti
Keyword(s):  
Cross Section ◽  
Ground State ◽  
Quantitative Estimation ◽  
Spin Waves ◽  
Low Frequency ◽  
Magnetic Nanostructures ◽  
Magnetization Direction ◽  
Micromagnetic Simulations ◽  
Waves Propagation ◽  
Moriya Interaction

The influence of the Dzyaloshinskii–Moriya interaction (DMI) on the eigenmodes of magnetic nanostructures is attracting interest for both fundamental reasons and prospects in applications. In this study, the characteristics of spin waves eigenmodes in either long stripes or elliptical dots magnetized in-plane, with lateral dimensions of the order of 100 nm, are analyzed by micromagnetic simulations in presence of a sizeable DMI. Using the GPU-accelerated software MuMax3, we show that the eigenmodes spectrum is appreciably modified by the DMI-induced non-reciprocity in spin-waves propagation: the frequencies of the eigenmodes are red-shifted and their spatial profiles appreciable altered due to the lack of stationary character in the direction orthogonal to the magnetization direction. As a consequence, one finds a modification of the expected cross-section of the different modes in either ferromagnetic resonance or Brillouin light scattering experiments, enabling one to detect modes that would remain invisible without DMI. In this respect, the modifications of the spectrum can be directly connected to a quantitative estimation of the DMI constant. Moreover, it is seen that for sufficiently large values of the DMI constant, the low-frequency odd eigenmode changes its profile and becomes soft, reflecting the transition of the ground state from uniform to chiral.

Photovoltage detection of Damon–Eshbach and dipolar edge spin waves of nanomagnets with two-dimensional electron gas system

2018 ◽  
Vol 57 (9S2) ◽  
pp. 09TF01
Author(s):  
Najla K. Almulhem ◽  
Maksym E. Stebliy ◽  
Alain Nogaret ◽  
Jean-Claude Portal ◽  
Harvey E. Beere ◽  
...  
Keyword(s):  
Spin Waves ◽  
Electron Gas ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Two Dimensional Electron Gas ◽  
Gas System ◽  
Dimensional Electron Gas ◽  
Edge Spin

scholarly journals Photovoltage Spectroscopy of Dipolar Spin Waves in Dy Micromagnets

2014 ◽  
Vol 215 ◽  
pp. 400-406 ◽  
Author(s):  
Alain Nogaret ◽  
Maxim E. Stebliy ◽  
Jean Claude Portal ◽  
Alexander S. Samardak ◽  
Alexey V. Ognev ◽  
...  
Keyword(s):  
Spin Waves ◽  
High Mobility ◽  
Spectroscopic Technique ◽  
Gate Arrays ◽  
Magnetostatic Waves ◽  
Spin Excitations ◽  
Dimensional Electron Gas ◽  
The Individual ◽  
Magnetic Dots ◽  
Edge Spin

We report on a sensitive spectroscopic technique for probing the spin excitations of individual submicron magnets. This technique uses a high mobility two dimensional electron gas (2DEG) confined in a GaAs/AlGaAs heterojunction to pick up the oscillating dipolar magnetic field emanating from the individual spin wave modes of micromagnets fabricated at its surface. We review a range of dynamic phenomena that demonstrate the formation of magnetostatic waves in finger gate arrays, dipolar edge spin waves in bar magnets, vortex hysteresis in magnetic dots and the photovoltage dependence on microwave polarization.

Topologically protected unidirectional edge spin waves and beam splitter

2017 ◽  
Vol 95 (1) ◽  
Author(s):  
X. S. Wang ◽  
Ying Su ◽  
X. R. Wang
Keyword(s):  
Beam Splitter ◽  
Spin Waves ◽  
Edge Spin

Language processing is not a race against time

2016 ◽  
Vol 39 ◽  
Author(s):  
Giosuè Baggio ◽  
Carmelo M. Vicario
Keyword(s):  
Information Processing ◽  
Human Brain ◽  
Language Processing ◽  
Cognitive Functions ◽  
Memory Systems ◽  
Language System ◽  
Moderating Factors

AbstractWe agree with Christiansen & Chater (C&C) that language processing and acquisition are tightly constrained by the limits of sensory and memory systems. However, the human brain supports a range of cognitive functions that mitigate the effects of information processing bottlenecks. The language system is partly organised around these moderating factors, not just around restrictions on storage and computation.

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