Magnetic switching instability of ultrathin magnetic films under crossing pulse fields with duration shorter than relaxation time

Yoonsung Han, Sangho Lee, Sunghoon Kim, Jinwon Lee, Ahram Kim, Jongill Hong

Research output: Contribution to journalArticle

Abstract

We have studied the magnetization switching behaviour of ultra-thin films when we apply synchronous longitudinal and transverse pulse fields with duration shorter than relaxation time. The film was rectangular Permalloy with a dimension of 800 × 300 × 2 nm. In the case of a pulse duration of 100 ps, the switching map showed the c-shaped switching characteristics rather than the typical quasi-static asteroid. We found that the c-shaped switching characteristics are associated with the abnormal switching behaviour. The abnormal switching area was also found for a pulse duration of 300 ps and even in the precessional switching region for a pulse duration of 500 ps. Our results show that the transient non-uniform demagnetization developed by the crossing pulses is responsible for such abnormal switching behaviour, and this is supported by simulation for the elliptical film whose demagnetization field distribution is relatively uniform.

Original languageEnglish
Pages (from-to)3979-3982
Number of pages4
JournalPhysica Status Solidi (A) Applications and Materials Science
Volume204
Issue number12
DOIs
Publication statusPublished - 2007 Dec 1

Fingerprint

magnetic switching
Magnetic films
Ultrathin films
magnetic films
Relaxation time
relaxation time
pulses
Demagnetization
pulse duration
demagnetization
Asteroids
Permalloys (trademark)
asteroids
Magnetization
magnetization

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering
  • Materials Chemistry

Cite this

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abstract = "We have studied the magnetization switching behaviour of ultra-thin films when we apply synchronous longitudinal and transverse pulse fields with duration shorter than relaxation time. The film was rectangular Permalloy with a dimension of 800 × 300 × 2 nm. In the case of a pulse duration of 100 ps, the switching map showed the c-shaped switching characteristics rather than the typical quasi-static asteroid. We found that the c-shaped switching characteristics are associated with the abnormal switching behaviour. The abnormal switching area was also found for a pulse duration of 300 ps and even in the precessional switching region for a pulse duration of 500 ps. Our results show that the transient non-uniform demagnetization developed by the crossing pulses is responsible for such abnormal switching behaviour, and this is supported by simulation for the elliptical film whose demagnetization field distribution is relatively uniform.",
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Magnetic switching instability of ultrathin magnetic films under crossing pulse fields with duration shorter than relaxation time. / Han, Yoonsung; Lee, Sangho; Kim, Sunghoon; Lee, Jinwon; Kim, Ahram; Hong, Jongill.

In: Physica Status Solidi (A) Applications and Materials Science, Vol. 204, No. 12, 01.12.2007, p. 3979-3982.

Research output: Contribution to journalArticle

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AU - Lee, Sangho

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AU - Hong, Jongill

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