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Defects introduced in ferromagnetic nanodisks may deeply affect the structure and dynamics of stable vortex-like magnetization. Here, analytical techniques are used for studying, among other dynamical aspects, how a small cylindrical cavity…

Materials Science · Physics 2009-11-13 W. A. Moura-Melo , A. R. Pereira , R. L. Silva , N. M. Oliveira-Neto

We study the dynamics of flat circular permalloy nanomagnets for 1.) magnetic vortex and 2.) single-domain configurations, using micromagnetic simulation. Dynamical studies for isolated vortex structures show that both the vorticity and the…

Materials Science · Physics 2009-11-10 A. Killinger , R. Höllinger , U. Krey

Effects of magnetic asymmetry on strongly coupled spin-vortex pairs with parallel core polarization and antiparallel chirality in synthetic nanomagnets are investigated. This includes vortex-core length asymmetry, biasing field asymmetry,…

Mesoscale and Nanoscale Physics · Physics 2019-05-22 E. Holmgren , M. Persson , V. Korenivski

Type II superconductors exhibit a fascinating phenomenology that is determined by the dynamical properties of the vortex matter hosted by the material. A crucial element in this phenomenology is vortex pinning by material defects, e.g.,…

Superconductivity · Physics 2020-11-25 Martin Buchacek , Vadim B. Geshkenbein , Gianni Blatter

Spin textures such as skyrmions and magnetic vortices are good candidates for a variety of applications, such as magnetic memories, oscillators and neuromorphic computing. Understanding the magnetic process of these systems is important, as…

Mesoscale and Nanoscale Physics · Physics 2018-03-16 Sergi Lendinez , Junjia Ding , Tomas Polakovic , John E. Pearson , Axel Hoffmann , Valentyn Novosad

Nanowires of two-dimensional (2D) crystals of type-II superconductor NbSe$_2$ prepared by electron-beam lithography were studied, focusing on the effect of the motion of Abrikosov vortices. We present magnetoresistance measurements on these…

Superconductivity · Physics 2016-06-08 Shaun A. Mills , Jacob J. Wisser , Chenyi Shen , Zhuan Xu , Ying Liu

A considerable challenge is faced by researchers wishing to identify the propagation vector(s) associated with a magnetic structure or a lattice distortion from powder diffraction data, due to the severe destruction of information by powder…

Materials Science · Physics 2009-05-07 A. S. Wills

In this theoretical investigation we address the effect of defects on thermal excitations in square-lattice dipolar arrays. The geometry of the nanomagnets, adopted from recent experiments [A. Farhan \textit{et al.}, Nature Phys.\…

Mesoscale and Nanoscale Physics · Physics 2014-02-19 Danny Thonig , Jürgen Henk

Surface based geometries of microfabricated wires or patterned magnetic films can be used to magnetically trap and manipulate ultracold neutral atoms or Bose-Einstein condensates. We investigate the magnetic properties of such atom chips…

Atomic Physics · Physics 2009-11-13 M. Volk , S. Whitlock , B. V. Hall , A. I. Sidorov

Symmetry-induced vortex-antivortex configurations in superconducting squares and triangles were predicted earlier; yet, they have not been resolved in experiment up to date. Namely, with vortex-antivortex states being highly unstable with…

Superconductivity · Physics 2009-09-29 R. Geurts , M. V. Milošević , F. M. Peeters

How stable vortex-like magnetization in magnetic nanodisks with small aspect ratio ($L/R<<1$) is affected by two antidots is investigated analytically and by Monte Carlo simulations. For suitable ranges of the physical parameters this…

Materials Science · Physics 2015-06-25 A. R. Pereira , A. R. Moura , W. A. Moura-Melo , D. F. Carneiro , S. A. Leonel , P. Z. Coura

We investigate vortex pinning in thin superconducting films with a square array of rectangular submicron holes ("antidots"). Two types of antidots are considered: antidots fully perforating the superconducting film, and "blind antidots",…

Superconductivity · Physics 2009-11-10 L. Van Look , B. Y. Zhu , R. Jonckheere , B. R. Zhao , Z. X. Zhao , V. V. Moshchalkov

Magnetic fields penetrate a type-II superconductor as magnetic flux quanta, called vortices. In a clean superconductor they arrange in a hexagonal lattice, while by adding periodic artificial pinning centers many other arrangements can be…

Defects in crystalline materials control the properties of materials, and their characterization focuses our strategies to optimize performance. Electron microscopy has served as the backbone of our understanding of defect structure and…

Materials Science · Physics 2019-03-19 Daniel S. Gianola , T. Ben Britton , Stefan Zaefferer

When an electron beam strikes a superconducting thin film near a pinned vortex, it locally increases the temperature-dependent London penetration depth and perturbs the circulating supercurrent, thereby distorting the vortex's magnetic…

Superconductivity · Physics 2010-08-31 John R. Clem

We review how a magnetic resonance force microscope (MRFM) can be applied to perform ferromagnetic resonance (FMR) spectroscopy of \emph{individual} sub-micron size samples. We restrict our attention to a thorough study of the spin-wave…

Vortices in a narrow superconducting strip with a square array of pinning sites are studied. The interactions of vortices with other vortices and with external sources (applied magnetic field and transport current) are calculated via a…

Superconductivity · Physics 2009-11-07 Clécio C. de Souza Silva , Leonardo R. E. Cabral , J. Albino Aguiar

Different ways exist in optics to realize photons carrying nonzero orbital angular momentum. Such photons with rotating wave fronts are called twisted photons. In microwaves, twisted fields can be produced based on small ferrite particles…

Optics · Physics 2015-06-04 M. Berezin , E. O. Kamenetskii , R. Shavit

Pinning at local defects is a significant road block for the successful implementation of technological paradigms which rely on the dynamic properties of non-trivial magnetic textures. In this report a comprehensive study of the influence…

In thin magnetic films with strong perpendicular anisotropy and strong demagnetizing field two ordered phases are possible. At low temperatures, perpendicularly oriented magnetic domains form a striped pattern. As temperature is increased…

Materials Science · Physics 2012-12-21 M. C. Ambrose R. L. Stamps