NMR studies of sputtered CoFe alloy thin films

Author

Thomson, T. ; Riedi, P.C. ; Platt, C.L. ; Berkowitz, A.E.

Author_Institution

Dept. of Phys. & Astron., St. Andrews Univ., UK

Volume

34

Issue

4

fYear

1998

fDate

7/1/1998 12:00:00 AM

Firstpage

1045

Lastpage

1047

Abstract

The inclusion of a Au layer in the magnetic tunnel junction structure Fe/MgO/CoFe substantially alters the magnetic properties. In this work we use zero field ⁵⁹Co NMR to see if these changes in magnetic properties are correlated with changes in the local atomic environment. The technique of spin-echo NMR allows the effective magnetic field (hyperfine field) at the nucleus to be determined and so provides information on the local atomic environments including strain effects and magnetic moments. The results show that the local atomic environment of Co does not change significantly, however the r.f. power required to obtain the maximum signal is substantially different when the Au layer is included showing that the r.f. electronic enhancement factor changes appreciably

Keywords

cobalt alloys; ferromagnetic materials; iron; iron alloys; magnesium compounds; magnetic moments; magnetic multilayers; spin echo (NMR); sputtered coatings; Au layer; Fe-MgO-Au-CoFe; Fe/MgO/CoFe; NMR; effective magnetic field; hyperfine field; magnetic moments; magnetic tunnel junction structure; spin-echo NMR; sputtered CoFe alloy thin films; strain effects; Atomic layer deposition; Electrodes; Gold; Iron; Magnetic films; Magnetic properties; Magnetic separation; Nuclear magnetic resonance; Saturation magnetization; Sputtering;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.706352

Filename

706352