Details

Autor(en) / Beteiligte

• Duc, N.H.
• Huong Giang, D.T.
• Thuc, V.N.
• Minh Hong, N.T.
• Chau, N.

Titel

Magnetisation process and magnetostriction in Fe/TerfecoHan/Fe sandwich films with perpendicular magnetic anisotropy

Ist Teil von

• Physica. B, Condensed matter, 2003-04, Vol.327 (2), p.328-333

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2003

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A new magnetostrictive film with out-of-plane magnetic anisotropy is realised in sandwich type of Fe/Tb(Fe 0.55Co 0.45) 1.5/Fe (denoted as Fe/TerfecoHan/Fe) films with a fixed individual TerfecoHan-layer thickness t TbFeCo=600 nm and variable Fe layer thickness t Fe=0, 10, 15 and 60 nm. As-deposited Fe/TerfecoHan/Fe films exhibit a magnetostriction as large as 10 −3 in an applied field of μ 0 H=0.6 T. This magnetostriction is exclusively observed in the field direction parallel to the sample length. The development of giant low-field magnetostriction has been performed by heat treatment. A maximal magnetostrictive susceptibility χ λ∥ =2.3×10 −2 T −1 is reached in μ 0 H=6 mT for the TerfecoHan film annealed at T A=450°C. For Fe/TerfecoHan/Fe sandwich films, however, the magnetic softness is just slightly improved with T A=250°C and 350°C. At T A=450°C, both the perpendicular magnetic anisotropy and the magnetic coercivity are reinforced. These magnetic behaviours are associated to the fact that the additional Fe-layers accelerated the crystallisation process in the TerfecoHan layer. The sandwich films are favourable for making the Fe/TerfecoHan/Fe a low-field magnetostrictive material for microelectromechanical systems as well as a perpendicular recording medium. Mechanisms of the magnetisation process and huge parallel magnetostriction are discussed for the films under investigation.