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Ivanov A, Bessarab PF, Uzdin VM, et al. Magnetic exchange force microscopy: theoretical analysis of induced magnetization reversals. Nanoscale. 2017;9(35):13320-13325doi: 10.1039/c7nr04036a.
Ivanov, A., Bessarab, P. F., Uzdin, V. M., & Jónsson, H. (2017). Magnetic exchange force microscopy: theoretical analysis of induced magnetization reversals. Nanoscale, 9(35), 13320-13325. https://doi.org/10.1039/c7nr04036a
Ivanov, Aleksei, et al. "Magnetic exchange force microscopy: theoretical analysis of induced magnetization reversals." Nanoscale vol. 9,35 (2017): 13320-13325. doi: https://doi.org/10.1039/c7nr04036a
Ivanov A, Bessarab PF, Uzdin VM, Jónsson H. Magnetic exchange force microscopy: theoretical analysis of induced magnetization reversals. Nanoscale. 2017 Sep 14;9(35):13320-13325. doi: 10.1039/c7nr04036a. PMID: 28858357.
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Nanoscale. 2017 Sep 14;9(35):13320-13325. doi: 10.1039/c7nr04036a.

Magnetic exchange force microscopy: theoretical analysis of induced magnetization reversals.

Nanoscale

Aleksei Ivanov, Pavel F Bessarab, Valery M Uzdin, Hannes Jónsson

Affiliations

  1. Science Institute and Faculty of Physical Sciences, University of Iceland VR-III, 107 Reykjavík, Iceland. [email protected] and Department of Physics, St. Petersburg State University, 199034, St. Petersburg, Russia.
  2. Science Institute and Faculty of Physical Sciences, University of Iceland VR-III, 107 Reykjavík, Iceland. [email protected] and Department of Natural Sciences, ITMO University, St. Petersburg, 197101, Russia.
  3. Department of Physics, St. Petersburg State University, 199034, St. Petersburg, Russia and Department of Natural Sciences, ITMO University, St. Petersburg, 197101, Russia.
  4. Science Institute and Faculty of Physical Sciences, University of Iceland VR-III, 107 Reykjavík, Iceland. [email protected] and Department of Applied Physics, Aalto University, Espoo, FI-00076, Finland.

PMID: 28858357 DOI: 10.1039/c7nr04036a

Abstract

In magnetic exchange force microscopy a magnetic tip is scanned over the surface of a solid and an image representing the exchange interaction recorded. Sudden changes in the image corresponding to magnetization switching can be monitored as a function of the tip-surface distance thereby giving important information about the lifetime of metastable magnetic states and how it is affected by the exchange interaction. Here, theoretical calculations are carried out to study the tip-surface interaction and determine the mechanism and rate of transitions in a magnetic exchange force microscopy experiment, and comparison made with reported experimental data on an Fe cluster interacting with an antiferromagnetic Fe overlayer on a W(001) surface. The activation energy was determined from calculations of minimum energy paths and the pre-exponential factor in the Arrhenius rate expression evaluated from harmonic transition state theory, extended to account for zero modes. A noncollinear extension of the Alexander-Anderson model was used to describe the magnetic properties of an atomic scale representation of the system. The calculations reveal how the tip size, tip-surface distance and magnetic field affect the lifetime of the magnetic states.

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