Large four-fold magnetic anisotropy in two-dimensional modulated Ni80Fe20 films

Kakazei, G. N.; Liu, X. M.; Ding, Jun; Golub, Vladimir; Salyuk, O.; Verba, Roman; Bunyaev, S. A.; Adeyeye, A. O.

doi:10.1063/1.4936994

Cited by 20 publications

(8 citation statements)

References 22 publications

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“…For our circular 150-nm SAF nanodisc arrays, this anisotropy is clearly caused by the inter-particle dipolar inter-actions. The observed 45 • -angle between the easy axes of the main mode and the edge modes can be explained by the difference in the spacing of the respective excitation nodes for single-layer nanodot arrays [34]. We are able to recreate this type of anisotropy in our micromagnetic simulations of SAF nano-arrays (to be discussed elsewhere).…”

mentioning

confidence: 86%

Higher-order ferromagnetic resonances in periodic arrays of synthetic-antiferromagnet nanodiscs

Borynskyi,

Polishchuk,

Melnyk

et al. 2021

Preprint

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We investigate spin dynamics in nanodisc arrays of synthetic-antiferromagnets (SAF) made of Py/NiCu/Py trilayers, where the NiCu spacer undergoes a Curie transition at about 200 K. The observed ferromagnetic resonance spectra have three distinct resonance modes at room temperature, which are fully recreated in our micromagnetic simulations showing also how the intra-SAF asymmetry can be used to create and control the higher-order resonances in the structure. Below the Curie temperature of the spacer, the system effectively transitions into a single-layer nanodisc array with only two resonance modes. Our results show how multi-layering of nano-arrays can add tunable GHz functionality relevant for such rapidly developing fields as magnetic metamaterials, magnonic crystals, arrays of spin-torque oscillators and neuromorphic junctions.

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mentioning

confidence: 86%

Higher-order ferromagnetic resonances in periodic arrays of synthetic-antiferromagnet nanodiscs

Borynskyi,

Polishchuk,

Melnyk

et al. 2021

Preprint

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“…Thus, each cell of the array consists of a heterogeneous pair of dots separated by the vector δ. To handle this problem in the framework of our theory the diagonal components of the demagnetization block-matrix (22) should rewritten in the following way :…”

Section: Nonreciprocal Spin Wave Edge Modementioning

confidence: 99%

“…Although the recent progress in the electron and ion beam lithography has made possible the fabrication of arrays of magnetic nanoelements (nanodots) on a large scale 9,[11][12][13]20,22,[25][26][27] , the fabrication of arrays of elements with high aspect ratios (height substantially larger than the radius), which is necessary for the effective dipolar interaction between the elements 22 , still remains a challenging technological problem. Nonetheless, we believe that materials with uniaxial crystallographic anisotropy 28 , like multi-layered composites of CoPt, Co 3 Pt, FePt, CoPd 29 , which exhibit strongly perpendicular static magnetization in the absence of a bias magnetic field, will make possible the physical realization of the magnetic nanodot arrays for signal processing applications in the near future.…”

Section: Novel Magnonicmentioning

confidence: 99%

“…These "self-biased" magnetic materials, which can function without heavy and bulky external permanent magnets, will be very attractive for applications in microwave signal processing and magnetic logic. One of the examples of such self-biased artificial magnetic materials are the arrays of periodically arranged and dipolarly coupled anisotropic magnetic nanoelements, in which the nano-size of the element guarantees its monodomain state, while the shape or/and crystallographic anisotropy determines the definite direction of its static magnetization [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] . The static magnetization of each anisotropic nanoelement can have more than one stable direction, which means that an array can exist in several distinct meta-stable static magnetization states 14,21 .…”

Section: Novel Magnonicmentioning

confidence: 99%

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Theoretical formalism for collective spin-wave edge excitations in arrays of dipolarly interacting magnetic nanodots

et al. 2016

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A general theory of collective spin wave edge modes in semi-infinite and finite periodic arrays of magnetic nanodots having uniform dynamic magnetization (macrospin approximation) is developed. The theory is formulated using a formalism of multi-vectors of magnetization dynamics, which allows one to study edge modes in arrays having arbitrarily complex primitive cells and lattice structure. The developed formalism can describe spin wave edge modes localized both at the physical edges of the array and at the internal "domain walls" separating the array regions existing in different static magnetization states. Using a perturbation theory, in the framework of the developed formalism it is possible to calculate damping of the edge modes and to describe their excitation by external variable magnetic fields. The theory is illustrated on the following practically important examples: (i) calculation of the FMR absorption in a finite nanodot array having the shape of a right triangle; (ii) calculation of the spectra of nonreciprocal spin wave edge modes, including the modes at the physical edges of an array and modes at the domain walls inside the array; (iii) study of the influence of the domain wall modes on the FMR spectrum of an array existing in a non-ideal chessboard antiferromagnetic ground state.

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“…Many different physical phenomena are utilized for this purpose, shaping the corresponding research directions of magnon spintronics [4], spin caloritronics [5,6,7], spin orbitronics [8], spin cavitronics [9,10], and others. One of the most promising building blocks of magnonics is constituted by magnonic crystals (MCs)-periodic magnetic structures supporting selective propagation of spin-waves [11][12][13][14][15][16][17][18][19][20]. In this artificial magnetic media, where a wide variety of parameters can be modulated, spin-waves undergo Bragg scattering resulting in the formation of spectral regions with prohibited propagation-spin-wave band gaps.…”

Section: Introductionmentioning

confidence: 99%

Spin-wave propagation through a magnonic crystal in a thermal gradient

Langner¹,

Bozhko²,

Bunyaev³

et al. 2018

J. Phys. D: Appl. Phys.

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The properties of a magnonic crystal are expected to be strongly influenced by the presence of a thermal gradient. We investigated the propagation of backward volume and surface magnetostatic spin-waves in a 1D magnonic crystal (MC) exposed to a continuous spatial temperature gradient. It is shown that the thermal gradient applied along the propagation direction leads to a frequency shift and a modification of the transmission characteristics of the spin-waves. The frequency shift is caused by a variation in saturation magnetization due to the change in absolute temperature. The altered transmission manifests itself in a broadening of MC band gaps and the corresponding narrowing of the MC passbands and is understood to be a result of a spatial transformation of the spin-waves wavelengths in a thermal gradient. Furthermore, the transmission characteristics of spin-waves in a thermal gradient have been verified by numerical calculations based on the approach of the transmission matrix. The results of the calculations demonstrate a good agreement with the experimentally measured data.

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Large four-fold magnetic anisotropy in two-dimensional modulated Ni80Fe20 films

Cited by 20 publications

References 22 publications

Higher-order ferromagnetic resonances in periodic arrays of synthetic-antiferromagnet nanodiscs

Higher-order ferromagnetic resonances in periodic arrays of synthetic-antiferromagnet nanodiscs

Theoretical formalism for collective spin-wave edge excitations in arrays of dipolarly interacting magnetic nanodots

Spin-wave propagation through a magnonic crystal in a thermal gradient

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