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

K. Aoshima, J. Hong, H. Kanai

Research output: Contribution to journalConference article

4 Citations (Scopus)

Abstract

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
Volume36
Issue number5 I
DOIs
Publication statusPublished - 2000 Sep 1

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Magnetostriction
magnetostriction
Magnetic anisotropy
X ray photoelectron spectroscopy
spacers
photoelectron spectroscopy
anisotropy

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

Cite this

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title = "Magnetostriction of free layer in top-type and bottom-type spin-valve films",
abstract = "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.",
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Magnetostriction of free layer in top-type and bottom-type spin-valve films. / Aoshima, K.; Hong, J.; Kanai, H.

In: IEEE Transactions on Magnetics, Vol. 36, No. 5 I, 01.09.2000, p. 3226-3228.

Research output: Contribution to journalConference article

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AU - Hong, J.

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N2 - 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.

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