Trial Production of the High Frequency Permeance meter

高频磁导仪的试制

• 批准号: 03555059
• 负责人: UCHIYAMA Susumu
• 金额: $ 3.33万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03555059/
• 关键词: Ultra high Frequency; magnetic thin film; permeability; strip line

The magnetic recording technology trend is towards increasingly higher recording density and higher data rates. Then magnetic thin films for read-write heads are required to exhibit a high permeability in still higher frequency region. In this project, the measurement of the high frequency permeability of soft magnetic thin film was investigated in ultra high frequency range up to 1GHz.The effective permeability of magnetic films were estimated from the change of impedance before and after inserting the film into a coil or strip line using a rf impedance meter (YHP419A). Considering the resonance frequency of the measurement circuit as well as the sensitivity of the impedance meter, among various coils and strip lines with different reactance, suitable ones were chosen depending on the frequency of the measurement. The real and imaginary parts of permeability were determined using the equivalent circuit. By using a short strip line, it became easy to measure the permeability up to 1GHz. As a result, it was found that the frequency response was improved in CoZr/SiO_2 multilayr and loss part at low frequency was much deduced in the multilayr. In the very thin film, the frequency response was further found to become much better than thicker and multilayr films. The real and imaginary parts cross with each other at about the resonance frequency calculated from Kittel's equation.

磁记录技术的趋势是朝着越来越高的记录密度和更高的数据速率发展。因此，要求用于读写磁头的磁性薄膜在更高的频率区域中表现出高的磁导率。本课题研究了软磁薄膜高频磁导率的测量方法，利用YHP 419 A射频阻抗计测量了磁性薄膜插入线圈或带状线前后的阻抗变化，从而估算出磁性薄膜的有效磁导率。考虑到测量电路的谐振频率以及阻抗计的灵敏度，在各种不同电抗的线圈和带状线中，根据测量频率选择合适的线圈和带状线。利用等效电路确定磁导率的真实的和虚部。通过使用短带状线，可以轻松测量高达1GHz的磁导率。结果表明，CoZr/SiO_2多层膜的频率响应得到了改善，低频损耗部分大大减小。在非常薄的膜中，进一步发现频率响应变得比更厚和多层膜好得多。真实的和虚部在从基特尔方程计算的谐振频率附近彼此交叉。

项目成果

M.Jimbo: "Soft Magnetic and Structural Properties of FeCo/Zr Multilayers" J.Magn.& Magn.Mater.126. 337-339 (1993)

M.Jimbo：“FeCo/Zr 多层膜的软磁和结构特性”J.Magn。

T.Nakamachi, M.Jimbo, S.Tsunashima, S.Uchiyama and T.Kato: "Soft Magnetic Properties of FeCo/Zr Multilayrs" J.Magn.Soc.Jpn.17. 385-390 (1993)

T.Nakamachi、M.Jimbo、S.Tsunashima、S.Uchiyama 和 T.Kato：“FeCo/Zr 多层的软磁性能”J.Magn.Soc.Jpn.17。

神保睦子: "Fe/CoZr積層膜の軟磁気特性の熱安定性" 日本応用磁気学会誌. 16. 285-290 (1992)

Mutsuko Jimbo：“Fe/CoZr 堆叠薄膜的软磁性能的热稳定性”日本应用磁学学会杂志 16. 285-290 (1992)。

神保 睦子: "Fe/CoZr積層膜の軟磁気特性の熱安定性" 日本応用磁気学会誌. 16. (1992)

Mutsuko Jimbo：“Fe/CoZr 堆叠薄膜的软磁性能的热稳定性”日本应用磁学学会杂志 16。（1992 年）

M.Jimbo: "Measurement of the High Frequency Permeability Of Soft Magnetic Single- and Multilayer Films" Proc.of Internat.Colloquim on Magnetic Films and Surfaces. 56-57 (1991)

M.Jimbo：“软磁单层和多层薄膜的高频磁导率的测量”Proc.of International.Colloquim on Magnetic Films and Surfaces。