Developmental Research of Ferromagnetic Thin Films for Surface Acoustic Wave with Field-Induced Giant Attenuation

场致巨衰减声表面波铁磁薄膜的研究进展

基本信息

  • 批准号:
    62850130
  • 负责人:
  • 金额:
    $ 3.9万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Developmental Scientific Research
  • 财政年份:
    1987
  • 资助国家:
    日本
  • 起止时间:
    1987 至 1989
  • 项目状态:
    已结题

项目摘要

SAW delay line with evaporated nickel films shows an attenuation peak in a magnetic field parallel to the film plane which strongly depends on film thickness and magnetic fields. The maximum attenuation induced by fields was found to become about 40 dB/cm at 20 Oe (= H_c) for 200 A^^゚ thick Ni film. In order to get a SAW device having much larger attenuation effect, we have prepared the SAW devices with multi-layered Ni/W films. It was found that the field-induced attenuation was enhanced in proportion to the number of Ni layers. These results indicate that a SAW device with multi-layered Ni/W films gives a very large attenuation which can not be obtained with the single layered Ni film.In this term of project(1989), we firstly tried to get the SAW device which can control the attenuation by a small bias magnetic field. We have prepared amorphous thin films of (Fe_<1-x>Co_x)_<85>Zr_<15> on the substrates of Foto-ceram and quartz by ac plasma sputtering and studied the hysteresis loop and the field dependence of ac susceptibility. When the amorphous films are made by sputtering under an argon gas atmosphere with pressure less than 1 X 10^<-3> Torr, the films were found to have coercive force less than 1 Oe, at which the ac susceptibility shows a very large peak compared with that of a single layered Ni film. Then we have got one of the most suitable films for the SAW device which will show very large field-induced attenuation by a small magnetic field.Secondly, we designed the new SAW device made of lithium tantalate (LiTaO_3) with larger electromechanical coupling factor than that of crystalline quartz. We prepared the four kinds of SAW devices of 10 mm x 5 mm dimension which can generate SAW of 200, 500, 700 and 900 MHz,' respectively (the SAW devices were offered by the good offices of FUJITSU LIMITED). Testings of the above SAW devices with amorphous (Fe_<1-x>Co_x)_<85>Zr_<15> films are now in progress.
蒸镀镍膜的SAW延迟线在平行于膜面的磁场中出现一个衰减峰,该衰减峰强烈地依赖于膜厚和磁场。对于200A·゚厚的Ni膜,在20Oe(=H_c)时,场致衰减的最大值约为40dB/cm。为了获得具有更大衰减效应的声表面波器件,我们制备了具有多层Ni/W薄膜的声表面波器件。结果表明,随镍层数的增加,场致衰减增强。这些结果表明,具有多层Ni/W薄膜的SAW器件具有很大的衰减,这是单层Ni薄膜所不能达到的。在本项目(1989)期间,我们首先尝试获得可以通过小偏置磁场来控制衰减的SAW器件。我们用交流等离子体溅射方法在FOTO-Ceram和石英衬底上制备了(Fe_&lt;1-x&gt;Co_x)_t;85&gt;Zr_&lt;15&gt;非晶薄膜,并研究了其磁滞回线和交流磁化率与磁场的关系。在气压小于1×10~(-3)Torr的Ar气氛下溅射制备的非晶态薄膜的矫顽力小于1Oe,其交流磁化率比单层Ni薄膜的磁化率有一个很大的峰值。其次,我们设计了一种新型的由钽酸锂(LiTaO_3)制成的SAW器件,其机电耦合系数比晶体石英的大。我们制备了4种尺寸为10 mm×5 mm的声表面波器件,分别可产生200、500、700和900 MHz的声表面波(声表面波器件由富士通公司的斡旋机构提供)。上述(Fe_&lt;1-x&gt;Co_x)_&lt;85&gt;Zr_&lt;15&gt;薄膜SAW器件的测试正在进行中。

项目成果

期刊论文数量(8)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
H.Yoshida, H.Fujimori, Y.Kaneko, S.Abe and H.Morita: "Attenuation of Surface Acoustic Wave through Sputtered Multi-layered Nickel Films" Journal de Physique Colloque. 49. 1795-1796 (1988)
H.Yoshida、H.Fujimori、Y.Kaneko、S.Abe 和 H.Morita:“通过溅射多层镍薄膜衰减表面声波”期刊 de Physique Colloque。
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H.Yoshida,H.Fujimori,Y.Kaneko,S.Abe and H.Morita: "Attenuation of Surface Acoustic Wave through Sputtered Multi-layered Nickel Films" Journal de Physique Colloque. 49. 1795-1796 (1988)
H.Yoshida、H.Fujimori、Y.Kaneko、S.Abe 和 H.Morita:“通过溅射多层镍薄膜衰减表面声波”期刊 de Physique Colloque。
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    0
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H.Yoshida,H.Fujimori,T.Kaneko,S.Abe and H.Morita: "Attenuation of Surface Acoustic Wave throgh Sputtered Multi-Layered Nickel Films" JOURNAL DE PHYSIQUE. C8. 1795-1796 (1988)
H.Yoshida、H.Fujimori、T.Kaneko、S.Abe 和 H.Morita:“通过溅射多层镍薄膜衰减表面声波”JOURNAL DE PHYSIQUE。
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H.Yoshida;H.Fujimori;T.Kaneko;S.Abe;H.Morita: J.de phyeique C. (1989)
H.吉田;H.藤森;T.Kaneko;S.Abe;H.森田:J.de phyeique C. (1989)
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FUJIMORI Hiroyasu其他文献

FUJIMORI Hiroyasu的其他文献

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{{ truncateString('FUJIMORI Hiroyasu', 18)}}的其他基金

Development of high frequency soft magnetic thin films consisting of ferromagnetic alloy/ferromagnetic insulator multi-phase granular materials
铁磁合金/铁磁绝缘体多相颗粒材料高频软磁薄膜的研制
  • 批准号:
    07555211
  • 财政年份:
    1995
  • 资助金额:
    $ 3.9万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Study on current-perpendicular-to-plane GMR materials by using amorphous magnetic alloy based multilayrs
基于非晶磁性合金多层膜的电流垂直平面GMR材料的研究
  • 批准号:
    05452283
  • 财政年份:
    1993
  • 资助金额:
    $ 3.9万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (B)
Soft Magnetic Thin Films Composed of Ultra Fine Crystallites
由超细晶组成的软磁薄膜
  • 批准号:
    03555152
  • 财政年份:
    1991
  • 资助金额:
    $ 3.9万
  • 项目类别:
    Grant-in-Aid for Developmental Scientific Research (B)
Study of Giant Magnetoresistance in Ferrimagnetic Multilayer Films
亚铁磁多层膜中巨磁阻的研究
  • 批准号:
    01460219
  • 财政年份:
    1989
  • 资助金额:
    $ 3.9万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (B)
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