Evidence of Long-Wavelength Collective Excitations in Magnetic Superlattices

Polushkin, N. I.; Michalski, Steven A.; Yue, Lanping; Kirby, Roger D.

doi:10.1103/physrevlett.97.256401

Cited by 18 publications

(12 citation statements)

References 25 publications

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“…Bulk magnonic crystals in the form of dipole coupled multi-layered films [16] usually have a finite thickness, and the dipole coupling results in the formation of standing-wave collective modes across the sample thickness. In contrast to these systems planar magnonic crystals, for example in the form of periodical arrays consisting of pairs of nanostripes from two different materials, support propagating collective modes [17][18][19][20]. For some modes travelling waves are prohibited in the stripes with the larger saturation magnetisation.…”

mentioning

confidence: 99%

Spin-wave tunnelling through a mechanical gap

Schneider¹,

Serga²,

Chumak³

et al. 2010

EPL

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We report on the experimental and theoretical investigation of spin-wave tunnelling through a mechanical gap in a ferromagnetic film. Samples with different gap widths were fabricated and the transmission of spin-wave pulses through the gaps was studied. Transmission through the gaps is possible due to the long-range character of the dipole-dipole interaction underlying dynamics of long-wavelength spin waves. By comparing our experimental results with the developed theoretical model, we demonstrate, that the local inhomogeneity of the static magnetisation and the internal field has a significant impact on the transmission.

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mentioning

confidence: 99%

Spin-wave tunnelling through a mechanical gap

Schneider¹,

Serga²,

Chumak³

et al. 2010

EPL

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“…In the 1990s and first years of this century, there has been also much research activity in the field of spintronics, [79][80][81][82][83][84][85][86][87][88] as well as the transport properties in magnetic SLs. [89][90][91][92][93][94][95][96][97][98][99][100][101][102][103][104][105][106][107][108] Although quantum dots has become also another hot field, the interest on periodic arrays of quantum dots is scarce. Lately, graphene and 2D systems [109,110] become important fields and most of the theoretical approaches rely on the Bloch theorem.…”

Section: Introductionmentioning

confidence: 99%

The Transfer Matrix Method and the Theory of Finite Periodic Systems. From Heterostructures to Superlattices

Pereyra

2021

Physica Status Solidi (b)

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Historically, the physics, energy spectrum, and wave functions of superlattices have had different levels of understanding. Unlike the standard approaches, based on theorems for infinite systems, the theory of finite periodic systems (TFPS) constitutes a genuine quantum approach, with closed analytical results. In this theory the finitene number of unit‐cells is an essential condition, while the number of propagating modes, as well as, the potential profiles (or refractive indices) are arbitrary. In this work, the transfer matrix definitions, symmetry properties, group representations, and relations with the scattering amplitudes are reviewed. The derivation of multichannel matrix polynomials (which reduce to Chebyshev polynomials in the one‐propagating mode limit), analytical formulas for resonant states, energy eigenvalues, eigenfunctions, parity symmetries, and discrete dispersion relations for superlattices with different confinement characteristics are reviewed. After showing the inconsistencies and limitations of hybrid approaches that combine the transfer‐matrix method with Floquet's theorem, some applications of the TFPS to multichannel negative resistance, ballistic transistors, coupled channels transport, spintronics, superluminal, and optical antimatter effects are revisited. Two high‐resolution superlattice related experiments are reviewed: the tunneling time in photonic band‐gap and the optical response of blue‐emitting diodes. It is shown that the TFPS accurately predicts the experimental results.

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“…This technique is suitable to pattern elemental semiconductors and compounds whose crystal structures are retained in the fast laser heating/cooling process, but its application to complex multi‐element materials has not been explored. As a related approach, laser interference irradiation (LII) was used to fabricate periodic structures in metal‐based thin films and multilayers . The mechanism of patterning is quite straightforward: the laser beams causes annealing or chemical intermixing mostly in one‐dimensional areas of light intensity maxima as a result of interference .…”

Section: Introductionmentioning

confidence: 99%

“…As a related approach, laser interference irradiation (LII) was used to fabricate periodic structures in metal‐based thin films and multilayers . The mechanism of patterning is quite straightforward: the laser beams causes annealing or chemical intermixing mostly in one‐dimensional areas of light intensity maxima as a result of interference . However, so far few studies have exploited the LII technique in patterning multi‐element compounds such as perovskite‐structured transition‐metal oxides.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Imprint of Amorphization and Phase Separation in Manganite Thin Films via Laser Interference Irradiation

Ding

Lin

et al. 2014

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Materials with mesoscopic structural and electronic phase separation, either inherent from synthesis or created via external means, are known to exhibit functionalities absent in the homogeneous counterparts. One of the most notable examples is the colossal magnetoresistance discovered in mixed-valence manganites, where the coexistence of nano- to micrometer-sized phase-separated domains dictates the magnetotransport. However, it remains challenging to pattern and process such materials into predesigned structures and devices. In this work, a direct laser interference irradiation (LII) method is employed to produce periodic stripes in thin films of a prototypical phase-separated manganite Pr0.65 (Ca0.75 Sr0.25 )0.35 MnO3 (PCSMO). LII induces selective structural amorphization within the crystalline PCSMO matrix, forming arrays with dimensions commensurate with the laser wavelength. Furthermore, because the length scale of LII modification is compatible to that of phase separation in PCSMO, three orders of magnitude of increase in magnetoresistance and significant in-plane transport anisotropy are observed in treated PCSMO thin films. Our results show that LII is a rapid, cost-effective and contamination-free technique to tailor and improve the physical properties of manganite thin films, and it is promising to be generalized to other functional materials.

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Evidence of Long-Wavelength Collective Excitations in Magnetic Superlattices

Cited by 18 publications

References 25 publications

Spin-wave tunnelling through a mechanical gap

Spin-wave tunnelling through a mechanical gap

The Transfer Matrix Method and the Theory of Finite Periodic Systems. From Heterostructures to Superlattices

Anisotropic Imprint of Amorphization and Phase Separation in Manganite Thin Films via Laser Interference Irradiation

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