Magnetization dynamics in CoFeB buffered perpendicularly magnetized Co/Pd multilayer

E. P. Sajitha, Jakob Walowski, D. Watanabe, S. Mizukami, Feng Wu, Hiroshi Naganuma, Mikihito Oogane, Yasuo Ando, T. Miyazaki

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The magnetic properties of CoFeB buffered [Co(0.3 nm)/Pd(x nm)]6 multilayer films have been investigated. It is found that the magnetic properties of the multilayer depended on the Pd thickness and for thickness below 0.5 nm no perperdicular anisotropy is observed. Magnetization dynamics in perpendicularly magnetized CoFeB-[Co/Pd] multilayer films are investigated using time-resolved magneto-optical Kerr effect (TRMOKE). The variation of precession frequency with external magnetic field for different palladium thickness is quantitatively understood using the macrospin approximation of the Landau-Lifshitz-Gilbert equation of motion. The Gilbert damping constant α, in the range 0.040.1, varying with the palladium thickness is reported. The observed α value is comparable to the damping coefficient of bulk Ni, and much lower than the reported values for perpendicularly magnetized films. The CoFeB buffer layer with in-plane anisotropy appears to significantly affect the precession frequency and thus the damping constant of the films.

Original languageEnglish
Article number5467527
Pages (from-to)2056-2059
Number of pages4
JournalIEEE Transactions on Magnetics
Volume46
Issue number6
DOIs
Publication statusPublished - 2010 Jun 1

Keywords

  • Fast magnetization dynamics
  • Gilbert damping constant
  • Magnetic multilayers
  • Magnetoresistive random access memory (MRAM)

ASJC Scopus subject areas

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

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