Materials Transactions Online

Materials Transactions, Vol.47 No.03 (2006) pp.811-816
© 2006 The Japan Institute of Metals

111Cd(←111In) Time Differential Perturbed Angular Correlation (TDPAC) Spectroscopy in Fe/Ag Films

Takashi Otomo1,, Saburo Nasu1, Shotaro Morimoto1, Koji Baba1,, Masayoshi Nishiyama2 and Tadashi Saito3

1Department of Physical Science, Graduate School of Engineering Science, Osaka University, Toyonaka 560-8531, Japan
2Central Workshop, Osaka University, Toyonaka 560-0043, Japan
3Radioisotope Research Center, Osaka University, Toyonaka 560-0043, Japan

We have investigated the magnetic properties of Cd atoms decayed from 111In at the interfaces of Fe/Ag evaporated films. In order to determine the magnetic properties of the films, we have measured 111Cd(←111In) time differential perturbed angular correlation (TDPAC) spectra at room temperature as a function of distance from the interface. Fe and Ag were evaporated using electron beam evaporation, and small amounts of radioactive 111In were evaporated by resistance-heating. The evaporated films had the following stacking orders on kapton polyimide film substrate: (1) polyimide/Fe 50 nm/111In/Fe x nm/Ag 20 nm (x=0.2,0.3,1,3,5,10), (2) polyimide/Fe 50 nm/Ag x nm/111In/Ag 20 nm (x=0,0.2,1). We used an Ag layer as a cap layer in order to prevent oxidation in air. TDPAC spectra were measured using a four-detector arrangement. The hyperfine magnetic field tends to be slightly larger when 111In is close to the interface of the Fe/Ag layer. The intensity of perturbation damps rapidly as 111In is close to the interface of Fe and Ag. These behaviors are thought to depend on electric field gradients and the influence of the surface roughness.

(Received 2005/9/20; Accepted 2006/1/24; Published 2006/3/15)

Keywords: 111Cd perturbed angular correlation, time differential perturbed angular correlation, hyperfine magnetic field, iron/silver film

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