Optimization of Co/Pt multilayers for applications of current-driven domain wall propagation

Ke Wang, M C Wu, S Lepadatu, J S Claydon, C H Marrows, Simon J Bending

Research output: Contribution to journalArticle

11 Citations (Scopus)
161 Downloads (Pure)

Abstract

A series of Co/Pt multilayers with perpendicular magnetic anisotropy has been grown by magnetron sputtering and characterized using magneto-optical Kerr effect measurements with a view to optimizing samples for current-driven domain motion applications. The influence of the thickness of both Co and Pt layers on the coercivity and switching behavior has been systematically investigated. The coercivity was found to depend strongly on the thickness of the Co layer and clear perpendicular magnetic anisotropy was observed in multilayer stacks with Co thickness ranging from 3 to 7 A. Upon increasing the Co thickness further the magnetization reverts to the in-plane direction and both the coercivity and the remanence drop rapidly, with the former becoming dominated by shape anisotropy. Increasing the thickness of the Pt buffer layer leads to improved perpendicular magnetic anisotropy with higher coercive fields. In contrast, the thickness of the Pt capping layers does not appear to have any systematic influence on the anisotropy in the range of 22-62 A. The coercivity can be further affected by the number of repeat Co layers in the stack due to exchange and magnetic coupling between adjacent Co layers. Upon increasing the thickness of the intermediate Pt spacer layer beyond 27 A, a transition from a coherent single-unit-like reversal to a sequential layer-by-layer reversal was observed. Structures with sharp switching fields and medium coercivity (50-150 Oe) have Co thickness fractions in the range 5 7 of the total stack height and should be well optimized for studying current-driven domain motion at low current densities.
Original languageEnglish
Article number083913
JournalJournal of Applied Physics
Volume110
Issue number8
DOIs
Publication statusPublished - 15 Oct 2011

Fingerprint

domain wall
optimization
propagation
coercivity
anisotropy
low currents
remanence
Kerr effects
spacers
magnetron sputtering
buffers
current density
magnetization

Cite this

Optimization of Co/Pt multilayers for applications of current-driven domain wall propagation. / Wang, Ke; Wu, M C; Lepadatu, S; Claydon, J S; Marrows, C H; Bending, Simon J.

In: Journal of Applied Physics, Vol. 110, No. 8, 083913, 15.10.2011.

Research output: Contribution to journalArticle

Wang, Ke ; Wu, M C ; Lepadatu, S ; Claydon, J S ; Marrows, C H ; Bending, Simon J. / Optimization of Co/Pt multilayers for applications of current-driven domain wall propagation. In: Journal of Applied Physics. 2011 ; Vol. 110, No. 8.
@article{35390d3ce4dc41f0ab694183da83d6b0,
title = "Optimization of Co/Pt multilayers for applications of current-driven domain wall propagation",
abstract = "A series of Co/Pt multilayers with perpendicular magnetic anisotropy has been grown by magnetron sputtering and characterized using magneto-optical Kerr effect measurements with a view to optimizing samples for current-driven domain motion applications. The influence of the thickness of both Co and Pt layers on the coercivity and switching behavior has been systematically investigated. The coercivity was found to depend strongly on the thickness of the Co layer and clear perpendicular magnetic anisotropy was observed in multilayer stacks with Co thickness ranging from 3 to 7 A. Upon increasing the Co thickness further the magnetization reverts to the in-plane direction and both the coercivity and the remanence drop rapidly, with the former becoming dominated by shape anisotropy. Increasing the thickness of the Pt buffer layer leads to improved perpendicular magnetic anisotropy with higher coercive fields. In contrast, the thickness of the Pt capping layers does not appear to have any systematic influence on the anisotropy in the range of 22-62 A. The coercivity can be further affected by the number of repeat Co layers in the stack due to exchange and magnetic coupling between adjacent Co layers. Upon increasing the thickness of the intermediate Pt spacer layer beyond 27 A, a transition from a coherent single-unit-like reversal to a sequential layer-by-layer reversal was observed. Structures with sharp switching fields and medium coercivity (50-150 Oe) have Co thickness fractions in the range 5 7 of the total stack height and should be well optimized for studying current-driven domain motion at low current densities.",
author = "Ke Wang and Wu, {M C} and S Lepadatu and Claydon, {J S} and Marrows, {C H} and Bending, {Simon J}",
note = "An Errautum relating to this article was published in Journal of Applied Physics, 110, 109903 (2011); doi: 10.1063/1.3664911",
year = "2011",
month = "10",
day = "15",
doi = "10.1063/1.3654045",
language = "English",
volume = "110",
journal = "Journal of Applied Physics",
issn = "0021-8979",
publisher = "American Institute of Physics Publising LLC",
number = "8",

}

TY - JOUR

T1 - Optimization of Co/Pt multilayers for applications of current-driven domain wall propagation

AU - Wang, Ke

AU - Wu, M C

AU - Lepadatu, S

AU - Claydon, J S

AU - Marrows, C H

AU - Bending, Simon J

N1 - An Errautum relating to this article was published in Journal of Applied Physics, 110, 109903 (2011); doi: 10.1063/1.3664911

PY - 2011/10/15

Y1 - 2011/10/15

N2 - A series of Co/Pt multilayers with perpendicular magnetic anisotropy has been grown by magnetron sputtering and characterized using magneto-optical Kerr effect measurements with a view to optimizing samples for current-driven domain motion applications. The influence of the thickness of both Co and Pt layers on the coercivity and switching behavior has been systematically investigated. The coercivity was found to depend strongly on the thickness of the Co layer and clear perpendicular magnetic anisotropy was observed in multilayer stacks with Co thickness ranging from 3 to 7 A. Upon increasing the Co thickness further the magnetization reverts to the in-plane direction and both the coercivity and the remanence drop rapidly, with the former becoming dominated by shape anisotropy. Increasing the thickness of the Pt buffer layer leads to improved perpendicular magnetic anisotropy with higher coercive fields. In contrast, the thickness of the Pt capping layers does not appear to have any systematic influence on the anisotropy in the range of 22-62 A. The coercivity can be further affected by the number of repeat Co layers in the stack due to exchange and magnetic coupling between adjacent Co layers. Upon increasing the thickness of the intermediate Pt spacer layer beyond 27 A, a transition from a coherent single-unit-like reversal to a sequential layer-by-layer reversal was observed. Structures with sharp switching fields and medium coercivity (50-150 Oe) have Co thickness fractions in the range 5 7 of the total stack height and should be well optimized for studying current-driven domain motion at low current densities.

AB - A series of Co/Pt multilayers with perpendicular magnetic anisotropy has been grown by magnetron sputtering and characterized using magneto-optical Kerr effect measurements with a view to optimizing samples for current-driven domain motion applications. The influence of the thickness of both Co and Pt layers on the coercivity and switching behavior has been systematically investigated. The coercivity was found to depend strongly on the thickness of the Co layer and clear perpendicular magnetic anisotropy was observed in multilayer stacks with Co thickness ranging from 3 to 7 A. Upon increasing the Co thickness further the magnetization reverts to the in-plane direction and both the coercivity and the remanence drop rapidly, with the former becoming dominated by shape anisotropy. Increasing the thickness of the Pt buffer layer leads to improved perpendicular magnetic anisotropy with higher coercive fields. In contrast, the thickness of the Pt capping layers does not appear to have any systematic influence on the anisotropy in the range of 22-62 A. The coercivity can be further affected by the number of repeat Co layers in the stack due to exchange and magnetic coupling between adjacent Co layers. Upon increasing the thickness of the intermediate Pt spacer layer beyond 27 A, a transition from a coherent single-unit-like reversal to a sequential layer-by-layer reversal was observed. Structures with sharp switching fields and medium coercivity (50-150 Oe) have Co thickness fractions in the range 5 7 of the total stack height and should be well optimized for studying current-driven domain motion at low current densities.

UR - http://www.scopus.com/inward/record.url?scp=80655141617&partnerID=8YFLogxK

UR - http://dx.doi.org/10.1063/1.3654045

U2 - 10.1063/1.3654045

DO - 10.1063/1.3654045

M3 - Article

VL - 110

JO - Journal of Applied Physics

JF - Journal of Applied Physics

SN - 0021-8979

IS - 8

M1 - 083913

ER -