Ni thickness influence on magnetic properties (Co/Ni/Co/Pt) multilayers with perpendicular magnetic anisotropy

R. Sbiaa, I. A. Al-Omari, M. Al Bahri, P. R. Kharel, M. Ranjbar, J. Åkerman, D. J. Sellmyer

Research output: Contribution to journalArticle

Abstract

We present a study of perpendicular magnetic anisotropy in [Co/Ni(t)/Co/Pt]×8 multilayers for use as free layers in magnetic tunnel junctions (MTJ) and spin valves. The thickness t of the Ni sub-layer was varied and the resulting magnetic properties were investigated. As determined from magnetic force microscopy and magnetometry measurements, all multilayers exhibited a perpendicular magnetic anisotropy with an increase of saturation magnetization with thickness t. From the temperature dependence of the magnetization, well described by a Bloch law, we find that the spin-wave stiffness constant of the [Co/Ni(t)/Co/Pt]×8 multilayers is larger compared to (Co/Ni) multilayers. These multilayers could be the basis for spintronic devices where the reduction of total Pt content could help to reduce the damping constant while keeping the magnetic anisotropy energy relatively high. These are conflicting requirements needed for high performance magnetic memory devices.

Original languageEnglish
Pages (from-to)585-589
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Volume441
DOIs
Publication statusPublished - Nov 1 2017

Fingerprint

Magnetic anisotropy
Magnetic properties
Multilayers
magnetic properties
anisotropy
magnetic storage
magnetization
magnetic force microscopy
tunnel junctions
magnons
magnetic measurement
stiffness
Magnetic force microscopy
damping
Magnetoelectronics
Spin waves
Tunnel junctions
saturation
Saturation magnetization
requirements

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Ni thickness influence on magnetic properties (Co/Ni/Co/Pt) multilayers with perpendicular magnetic anisotropy. / Sbiaa, R.; Al-Omari, I. A.; Al Bahri, M.; Kharel, P. R.; Ranjbar, M.; Åkerman, J.; Sellmyer, D. J.

In: Journal of Magnetism and Magnetic Materials, Vol. 441, 01.11.2017, p. 585-589.

Research output: Contribution to journalArticle

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AU - Sbiaa, R.

AU - Al-Omari, I. A.

AU - Al Bahri, M.

AU - Kharel, P. R.

AU - Ranjbar, M.

AU - Åkerman, J.

AU - Sellmyer, D. J.

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AB - We present a study of perpendicular magnetic anisotropy in [Co/Ni(t)/Co/Pt]×8 multilayers for use as free layers in magnetic tunnel junctions (MTJ) and spin valves. The thickness t of the Ni sub-layer was varied and the resulting magnetic properties were investigated. As determined from magnetic force microscopy and magnetometry measurements, all multilayers exhibited a perpendicular magnetic anisotropy with an increase of saturation magnetization with thickness t. From the temperature dependence of the magnetization, well described by a Bloch law, we find that the spin-wave stiffness constant of the [Co/Ni(t)/Co/Pt]×8 multilayers is larger compared to (Co/Ni) multilayers. These multilayers could be the basis for spintronic devices where the reduction of total Pt content could help to reduce the damping constant while keeping the magnetic anisotropy energy relatively high. These are conflicting requirements needed for high performance magnetic memory devices.

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