Title :
Embedded iron nanoclusters prepared by Fe ion implantation and GMR property
Author :
Hayashi, N. ; Sakamoto, I. ; Okada, T. ; Tanoue, H. ; Hirai, T. ; Wakabayashi, H. ; Toriyama, T.
Author_Institution :
Res. Center of Ion Beam Technol., Hosei Univ., Tokyo, Japan
Abstract :
Magnetization and magnetoresistance were studied in iron-ion-implanted aluminum oxide crystals. The implantation was done to a dose of 2×1017 ions/cm2 with ion energy of 100 keV. We have observed a magnetoresistance ratio of 6.0% at the field of H=12 kOe. Conversion electron Mossbauer spectroscopy and magnetization measurement show that most of the implanted ions precipitate as α-Fe clusters with a few nm size in radii; the spectra reveals clusters in both superparamagnetic and ferromagnetic states. To study the process of the nanocrystalline formation 57 Fe ions as Mossbauer probes were partially implanted at a fluence of 2×1017 ions/cm2
Keywords :
Mossbauer effect; conversion electron spectra; giant magnetoresistance; ion implantation; iron; metal clusters; nanostructured materials; superparamagnetism; 57Fe Mossbauer probes; Fe ion implantation; Fe-Al2O3; conversion electron Mossbauer spectroscopy; embedded nanoclusters; ferromagnetic state; giant magnetoresistance; magnetization; superparamagnetic state; Aluminum oxide; Crystals; Electrons; Giant magnetoresistance; Ion implantation; Iron; Magnetic field measurement; Magnetization; Size measurement; Spectroscopy;
Conference_Titel :
Ion Implantation Technology, 2000. Conference on
Conference_Location :
Alpbach
Print_ISBN :
0-7803-6462-7
DOI :
10.1109/.2000.924270
