2000 Fiscal Year Final Research Report Summary
Synthesis of Magnetic Granular Materials with GMR and Soft Magnetic Properties by Cluster Deposition Technique
| Project/Area Number |
11650004
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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 |
Applied materials science/Crystal engineering
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| Research Institution | Utsunomiya University |
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Principal Investigator |
ISHII Kiyoshi Utsunomiya University, Professor, 工学部, 教授 (30134258)
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| Co-Investigator(Kenkyū-buntansha) |
SUMIYAMA Kenji Nagoya Institute of Technology Professor, 工学部, 教授 (70101243)
OHBA Takuya Shimane University, Associate Professor, 総合理工学部, 助教授 (00211110)
IRIE Akinobu Utsunomiya University, Associate Professor, 工学部, 助教授 (90241843)
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| Project Period (FY) |
1999 – 2000
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| Keywords | Granular material / Magnetic film / Cluster deposition / Sputtered film / Gas now sputtering |
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| Research Abstract |
A new method to prepare magnetic granular materials has been developed in this hdy. In .I the method manometer-sized clusters of ferromagnetic metal are mixed with a different metal vapor, and the mixture is deposited on the substrate. It is expected to allow the independent control of the size and density of the magnetic particles in the granular film. The magnetic properties and giant magnetoresistance (GMR) were investigated for Fe/Ag and Co/Ag films prepared by this method. The results are summarized as follows.
1. Fe and Co clusters with the mean diameter of about 5 nm were well dispersed in Ag matrix.
2. Interparticle magnetic interaction became strong with increasing the particle density in Fe/Ag system.
3. The coercive force was 5 Oe for the Fe/Ag film with Fe content of 35 at%. Moreover, the film had GMR ratio of 10 % at room temperature.
4. For the first time, magnetic behavior described by a Curie-Weiss-like law was observed for manometer particle system, and ferromagnetic ordering at room temperature was observed to take place at the Fe content of 35 at% for Fe/Ag films.
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