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Imprinting01:22

Imprinting

Behavioral imprinting is observed in some newborn animals and occurs when they develop strong and specific attachments to another animal (usually a parent) following brief, early-life exposures. Offspring imprint onto parents within a brief period after birth or hatching; this time window is called the critical period. Once imprinting occurs, the bond established between the parents and their offspring is usually long-lasting.
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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
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Ferromagnetism01:31

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Scanning SQUID Study of Vortex Manipulation by Local Contact
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Imprinting vortices into antiferromagnets.

J Sort1, K S Buchanan, V Novosad

  • 1Institució Catalana de Recerca i Estudis Avançats (ICREA) and Departament de Física, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain. jordi.sort@uab.es

Physical Review Letters
|October 10, 2006
PubMed
Summary

Displaced vortex structures in magnetic bilayers create unique asymmetric hysteresis loops. This effect, achieved by cooling in small fields, results from competing energies within the material.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Exchange-coupled ferromagnetic-antiferromagnetic bilayers are key for spintronic devices.
  • Vortex structures in magnetic materials influence their behavior.

Purpose of the Study:

  • Investigate imprinting symmetric and displaced vortex structures in magnetic disks.
  • Analyze the resulting magnetic hysteresis loops.

Main Methods:

  • Fabrication of micron-sized ferromagnetic-antiferromagnetic bilayer disks.
  • Controlled cooling through the blocking temperature in applied magnetic fields.
  • Micromagnetic simulations to model magnetic behavior.

Main Results:

  • Displaced vortices imprint asymmetric hysteresis loops.
  • Loops exhibit curved, reversible central sections with nonzero remanent magnetization.
  • Imprinting achieved by cooling through blocking temperature in small fields.

Conclusions:

  • Displaced vortex structures lead to novel asymmetric magnetic hysteresis.
  • The observed behavior arises from the interplay of different system energies.
  • This finding offers insights into controlling magnetic states in bilayers.