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Quantum depinning of the magnetic vortex core in micron-size permalloy disks

Ricardo Zarzuela, Saül Vélez, Joan Manel Hernandez, Javier Tejada, and Valentyn Novosad
Phys. Rev. B 85, 180401(R) – Published 3 May 2012
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Abstract

The vortex state, characterized by an in-plane closed flux domain structure and an out-of-plane magnetization at its center (the vortex core), is one of the magnetic equilibria of thin soft ferromagnetic micron-size dots. In the past two decades many groups have been working on the dynamics of the magnetic moment in nanomagnetic materials at low temperatures, giving rise to the observation of quantum relaxations and quantum hysteresis cycles. We report experimental evidence of quantum dynamics of the vortex core of micron-size permalloy (Fe19Ni81) disks induced by the application of an in-plane magnetic field. It is attributed to the quantum tunneling of the vortex core through pinning barriers, which are associated with structural defects in the dots, toward its equilibrium position.

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  • Received 10 February 2012

DOI:https://doi.org/10.1103/PhysRevB.85.180401

©2012 American Physical Society

Authors & Affiliations

Ricardo Zarzuela1, Saül Vélez1, Joan Manel Hernandez1, Javier Tejada1,*, and Valentyn Novosad2

  • 1Grup de Magnetisme, Departament de Física Fonamental, Universitat de Barcelona, Barcelona 08028, Spain
  • 2Materials Sciences Division, Argonne National Laboratory, Argonne, Illinois 60439, USA

  • *jtejada@ubxlab.com

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Issue

Vol. 85, Iss. 18 — 1 May 2012

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