Heat-assisted magnetization reversal using pulsed laser irradiation in patterned magnetic thin film with perpendicular anisotropy

Keita Waseda, Ryosuke Doi, Budi Purnama, Satoru Yoshimura, Yukio Nozaki, Kimihide Matsuyama

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Cooling velocity of patterned Tb-Fe film with a lateral size of 50 × 50 μm2 was experimentally investigated for the application to heat-assisted writing operation in high-density magnetic random access memories. The patterned Tb-Fe film was heated-up by using pulsed YAG laser irradiations with the duration of 1 ns which is realizing a semi-adiabatic heating process. The ratio of magnetization reversal in the patterned Tb-Fe film was estimated by measuring an anomalous Hall voltage. The main results are as follows: (1) Magnetic field required for magnetization reversal of Tb-Fe film was decreased from 1.4 kOe to 200 Oe by applying the heat-assisted magnetization reversal method. (2) Cooling velocity of patterned Tb-Fe film can be estimated by using pulsed magnetic fields with various time delays from the pulsed laser irradiation. (3) With increasing the thermal conductivity coefficient of electrical leads, the velocity to cool the patterned Tb-Fe film increased.

Original languageEnglish
Pages (from-to)2483-2486
Number of pages4
JournalIEEE Transactions on Magnetics
Volume44
Issue number11 PART 2
DOIs
Publication statusPublished - 2008 Nov 1
Externally publishedYes

Keywords

  • Cooling velocity
  • Heat-assisted magnetization reversal
  • Magnetic random access memory
  • Patterned magnetic film
  • Perpendicular magnetic anisotropy
  • Pulsed laser irradiation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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