scholarly journals Switchable giant nonreciprocal frequency shift of propagating spin waves in synthetic antiferromagnets

2020 ◽  
Vol 6 (17) ◽  
pp. eaaz6931 ◽  
Author(s):  
Mio Ishibashi ◽  
Yoichi Shiota ◽  
Tian Li ◽  
Shinsaku Funada ◽  
Takahiro Moriyama ◽  
...  
Keyword(s):  
Frequency Shift ◽  
Spin Wave ◽  
Spin Waves ◽  
Wave Dispersion ◽  
Dipolar Interaction ◽  
Logic Circuits ◽  
Relative Configuration ◽  
Magnetic Layers ◽  
The Difference ◽  
Interlayer Exchange

The nonreciprocity of propagating spin waves, i.e., the difference in amplitude and/or frequency depending on the propagation direction, is essential for the realization of spin wave–based logic circuits. However, the nonreciprocal frequency shifts demonstrated so far are not large enough for applications because they originate from interfacial effects. In addition, switching of the spin wave nonreciprocity in the electrical way remains a challenging issue. Here, we show a switchable giant nonreciprocal frequency shift of propagating spin waves in interlayer exchange–coupled synthetic antiferromagnets. The observed frequency shift is attributed to large asymmetric spin wave dispersion caused by a mutual dipolar interaction between two magnetic layers. Furthermore, we find that the sign of the frequency shift depends on relative configuration of two magnetizations, based on which we demonstrate an electrical switching of the nonreciprocity. Our findings provide a route for switchable and highly nonreciprocal spin wave–based applications.

Spin Waves in Multilayers with Different Magnitudes of the Magnetization, Exchange, and Anisotropy

2012 ◽  
Vol 190 ◽  
pp. 71-74 ◽  
Author(s):  
V.A. Ignatchenko ◽  
D.S. Tsikalov
Keyword(s):  
Spin Wave ◽  
Spin Waves ◽  
Wave Spectrum ◽  
Band Gaps ◽  
Sinusoidal Modulation ◽  
One Dimensional ◽  
Material Parameters ◽  
Magnetic Parameters ◽  
The Difference ◽  
Spin Wave Spectrum

The spin-wave spectrum in one-dimensional magnon crystals periodic superlattices (SLs) is investigated for the rectangular and sinusoidal modulation profile of the material parameters. The dependences of band gaps in the spectrum on both the difference of the magnetic parameters in adjacent layers and the ratio of the layer thicknesses are calculated.

Dzyaloshinskii–Moriya interaction determined from spin wave nonreciprocity and magnetic bubble asymmetry in Pt/Co/Ir/Co/Pt synthetic ferrimagnets

2021 ◽  
Author(s):  
Oksana Koplak ◽  
Alexander Bezverkhnii ◽  
Alexandr Sadovnikov ◽  
Roman Morgunov ◽  
Michel Hehn ◽  
...  
Keyword(s):  
Domain Wall ◽  
Spin Wave ◽  
Perpendicular Magnetic Anisotropy ◽  
Wave Dispersion ◽  
Interlayer Exchange Coupling ◽  
Wall Velocity ◽  
Domain Wall Velocity ◽  
Interlayer Exchange ◽  
Moriya Interaction ◽  
Light Scattering Technique

Abstract We present analysis of the effect of Dzyaloshinskii–Moriya interaction (DMI) on spin wave nonreciprocity and bubble expansion asymmetry in Pt/Co/Ir/Co/Pt synthetic ferrimagnets with perpendicular magnetic anisotropy. We propose analysis of the DMI by Brillouin Light Scattering technique (BLS) and Kerr microscopy (MOKE) in the presence of interlayer exchange coupling strongly changing spin wave dispersion law and field dependences of domain wall velocity in comparison with those observed earlier in Ir/Co/Pt structures with a single Co layer. We have determined DMI values of each Co layer from unusually inverted dependence of velocity of the domain wall on in-plane magnetic field. Opposite signs of effective fields and DMI fields in the two Co layers invert field dependence of the domain wall velocity. DMI energy determined from BLS is higher than values, determined by bubble expansion.

HIGH ENERGY MAGNETIC EXCITATIONS IN SINGLE DOMAIN HOMOGENEOUS ANTIFERROMAGNETIC γ-Mn(18%Cu) ALLOY AT 10 K

1993 ◽  
Vol 07 (01n03) ◽  
pp. 659-662
Author(s):  
K. MIKKE ◽  
T.M. HOLDEN ◽  
J.A. FERNANDEZ-BACA ◽  
E. FAWCETT ◽  
J. JANKOWSKA-KISIELIŃSKA
Keyword(s):  
Dispersion Relation ◽  
Spin Wave ◽  
Spin Waves ◽  
Wave Dispersion ◽  
High Energy ◽  
Single Domain ◽  
Magnetic Excitations ◽  
Cu Alloy ◽  
Spin Wave Dispersion

Measurements of spin waves in homogeneous antiferromagnetic single domain fct γ-Mn(18%Cu) alloy at 10 K were performed up to energies of 82.7 meV yielding v=224±3 meV Å, Eg=7.8±0.2 meV and damping parameters Γ0=2 meV and Γ1=101.4±2.4 meV Å. There is a evidence on the anisotropy of the spin wave dispersion relation.

Nonreciprocal Spin Waves in a Magnonic Crystal with In-Plane Static Magnetization

SPIN ◽  
2016 ◽  
Vol 06 (04) ◽  
pp. 1640013 ◽  
Author(s):  
Roman Verba ◽  
Elena Bankowski ◽  
Thomas Meitzler ◽  
Vasil Tiberkevich ◽  
Andrei Slavin
Keyword(s):  
Spin Wave ◽  
Mirror Symmetry ◽  
Magnetic State ◽  
Spin Waves ◽  
Complex Structure ◽  
Periodic Array ◽  
Static Magnetization ◽  
Magnonic Crystals ◽  
Magnonic Crystal ◽  
The Difference

It is shown that spin waves propagating in a planar periodic array of dipolarly coupled magnetic strips or dots with in-plane static magnetization can be nonreciprocal. The conditions of the spin waves nonreciprocity are: (i) breaking of the mirror symmetry of an array with respect to its plane, and (ii) complex structure of the array lattice. These conditions can be satisfied, e.g., if an array consists of at least two groups of strips (dots) having different thicknesses (heights). The largest nonreciprocity can be achieved if the static magnetic state of an array is antiferromagnetic, and the difference in the strip thicknesses is about two times. A significant dependence of the spin wave nonreciprocity on the static magnetic state of a strip array allows one to create magnonic crystals with reconfigurable nonreciprocal properties.

scholarly journals Nanoscale magnonic Fabry-Pérot resonator for low-loss spin-wave manipulation

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Huajun Qin ◽  
Rasmus B. Holländer ◽  
Lukáš Flajšman ◽  
Felix Hermann ◽  
Rouven Dreyer ◽  
...  
Keyword(s):  
Spin Wave ◽  
Dipolar Coupling ◽  
Transmission Loss ◽  
Spin Waves ◽  
Wave Dispersion ◽  
Material Structure ◽  
Low Loss ◽  
Device Structure ◽  
Wave Transport ◽  
Fabry Perot

AbstractActive control of propagating spin waves on the nanoscale is essential for beyond-CMOS magnonic computing. Here, we experimentally demonstrate reconfigurable spin-wave transport in a hybrid YIG-based material structure that operates as a Fabry-Pérot nanoresonator. The magnonic resonator is formed by a local frequency downshift of the spin-wave dispersion relation in a continuous YIG film caused by dynamic dipolar coupling to a ferromagnetic metal nanostripe. Drastic downscaling of the spin-wave wavelength within the bilayer region enables programmable control of propagating spin waves on a length scale that is only a fraction of their wavelength. Depending on the stripe width, the device structure offers full nonreciprocity, tunable spin-wave filtering, and nearly zero transmission loss at allowed frequencies. Our results provide a practical route for the implementation of low-loss YIG-based magnonic devices with controllable transport properties.

scholarly journals Co/Cu/Co Pseudo Spin-Valve System Prepared by Magnetron Sputtering with Different Argon Pressure

2015 ◽  
Vol 644 ◽  
pp. 211-214 ◽  
Author(s):  
A.V. Svalov ◽  
A.N. Sorokin ◽  
P.A. Savin ◽  
Alfredo García-Arribas ◽  
A. Fernández ◽  
...  
Keyword(s):  
Magnetron Sputtering ◽  
Spin Valve ◽  
Spin Rotation ◽  
Argon Pressure ◽  
Dc Magnetron Sputtering ◽  
Soft Layer ◽  
Valve System ◽  
Magnetic Layers ◽  
Moderate Field ◽  
The Difference

Thin Co films were fabricated by DC magnetron sputtering. The effect of argon pressure on the microstructure, surface morphology and magnetic properties of the samples was systematically studied. It was found that with the increase of argon pressure, the sharpness of the crystalline texture of the samples declines, the roughness of film surfaces and the coercivity of the films increase. Based on these results, a Co/Cu/Co pseudo spin-valve system was designed and the corresponding structures were fabricated. The difference in coercivity of magnetic layers was obtained by deposition of the Co layers at different Ar pressures. Change of the resistance of this trilayer is induced at a moderate field by the spin rotation in the soft layer with lower coercivity.

Spin‐Wave Dispersion in KMnF3

1966 ◽  
Vol 37 (3) ◽  
pp. 1054-1055 ◽  
Author(s):  
S. J. Pickart ◽  
M. F. Collins ◽  
C. G. Windsor
Keyword(s):  
Spin Wave ◽  
Wave Dispersion ◽  
Spin Wave Dispersion
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