Studies of isolated and interacting ferromagnetic gapped nanorings

ORAL

Abstract

We have used micromagnetic simulation and magnetic force microscopy (MFM) to study isolated and interacting permalloy nanorings that are lithographically fabricated with gaps that prevent a rotationally symmetric magnetic state. The gapped nanorings have inner and outer radii of 200 and 300 nm respectively, and the gap has a subtended width of $\sim $20 degrees. The nanorings generate a strong magnetic field only in the gap, and thus the magnetization states of gapped nanorings are much more accessible to MFM imaging than complete rings. We have investigated the properties of these gapped nanorings, including the anisotropy in their coercive field and the relative alignment of the magnetic polarization in coupled pairs.

*We acknowledge the financial support from DOE and Army Research Office.We are grateful to Professor Chris Leighton and Mike Erickson for assistance with sample preparation.

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Authors

  • Jie Li

    • Pennsylvania State University
    • Department of Physics and Materials Research Institute, Pennsylvania State University, University Park, PA 16802
    • Penn State University

  • Sheng Zhang

    • Pennsylvania State University
    • Department of Physics and Materials Research Institute, Pennsylvania State University, University Park, PA 16802
    • Penn State University

  • Jason Bartell

    • Department of Physics and Materials Research Institute, Pennsylvania State University, University Park, PA 16802
    • Penn State University

  • Chris Grigas

    • Penn State University

  • Cristiano Nisoli

    • Theoretical Division and CNLS Los Alamos National Laboratory, Los Alamos NM
    • Los Alamos National Lab

  • Paul Lammert

    • Pennsylvania State University
    • Department of Physics and Materials Research Institute, Pennsylvania State University, University Park, PA 16802
    • Penn State University

  • Vincent Crespi

    • Penn State University
    • Pennsylvania State University
    • Department of Physics, Penn State University
    • Department of Physics and Materials Research Institute, Pennsylvania State University, University Park, PA 16802

  • Peter Schiffer

    • The Pennsylvania State University, University Park, PA
    • Pennsylvania State University
    • Department of Physics and Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
    • Department of Physics and Materials Research Institute, Pennsylvania State University, University Park, PA 16802
    • Penn State University