2006 Fiscal Year Final Research Report Summary
Ion irradiated modifications on magnetostrictive thin films
| Project/Area Number |
16560616
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Structural/Functional materials
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| Research Institution | Tokai University |
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Principal Investigator |
MATSUMURA Yoshihito Tokai University, Faculty of Engineering, Energy Science & Technology, Professor, 工学部, 教授 (60239085)
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| Co-Investigator(Kenkyū-buntansha) |
NISHI Yoshitake Tokai University, School of Engineering, Professor, 工学部, 教授 (80119693)
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| Project Period (FY) |
2004 – 2006
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| Keywords | Ion Irradiation / Giant Magnetostriction / Thin Film / Terbium / Samarium / Iron / Aluminum / Inner Stress |
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| Research Abstract |
Magnetostrictive properties of Ar ion-irradiated R-Fe(R : Tb, Sm) thin films were studied with respect to internal stress. Film samples were prepared by a magnetron sputtering. The film composition was Tb_<36>Fe_<64> and Sm_<27>Fe_<73> with amorphous structures. After the deposition, film samples were irradiated with Ar ions at 10 keV, 2.7-8.0×10^<-1> A/m^2 and doses of 1x10^<22> ions/m^2. Magnetostrictive susceptibility of the Tb_<36>Fe_<64> film decreased with increasing ion current density by 5.5x10^<-1> A/m^2, however, improved with high current density above 7.0 x10^<-1> A/m^2. Magnetostrictive susceptibility of Sm_<27>Fe_<73> increased with increasing ion current density up to 5.5 x10^<-1> A/m^2. This was caused by increase of compressive stress induced by Ar ion irradiation with low current density and stress relaxation by increased temperature during irradiation with high current density. The magnetic properties were found profoundly influenced by stresses induced by competitive factors such as irradiation damage and thermal annealing effect.
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