Magnetostriction of free layer in top-type and bottom-type spin-valve films

K. Aoshima, J. Hong, H. Kanai

Research output: Contribution to journalConference articlepeer-review


We investigated magnetostriction of a free layer in top-type and bottom-type spin valves. The magnetostriction of the free layer in the top-type spin valve increased as the thickness of free layer decreased, which can be attributed to the increase in the surface magnetic anisotropy. However, the magnetostriction of the free layer in the bottom-type spin valve exibited no significant change with decreasing in the thickness of free layer, and was smaller than that of in the top-type spin valve. This difference may come from the degree of intermixing at the interface of the free layer. We confirmed by X-ray Photoelectron Spectroscopy that intermixing between the spacer and free layer, Cu and CoFeB respectively, can be quite different for the top-type and the bottom-type spin valves, and that the magnetostriction can be influenced by the degree of intermixing. The magnetostriction tends to be small value when intermixing is significant, as we found in the bottom-type spin valve.

Original languageEnglish
Pages (from-to)3226-3228
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number5 I
Publication statusPublished - 2000 Sept
Event2000 International Magnetics Conference (INTERMAG 2000) - Toronto, Ont, Canada
Duration: 2000 Apr 92000 Apr 12

All Science Journal Classification (ASJC) codes

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


Dive into the research topics of 'Magnetostriction of free layer in top-type and bottom-type spin-valve films'. Together they form a unique fingerprint.

Cite this