Development of magnetoresistance sensing materials consisting of granulan materials with micro-patterned soft magnetic alloy films

微图案软磁合金薄膜颗粒材料磁阻传感材料的开发

基本信息

批准号：
12555183
负责人：
TAKANASHI Koki
金额：
$ 8.64万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

项目摘要

Currently, magnetic sensors have been important devices, and are actually used for many systems and purposes. Magnetic granular thin film is one of most important materials applicable to magnetic sensors because it can be made easily by a conventional sputtering technique. Furthermore, excellent field-sensitivity has been achieved in granular-in-gap (GIG) structures in which magnetic granular film is put in a lateral gap between a couple of soft magnetic alloy electrodes.In this study, we have investigated on (i) optimization of GIG structures, (ii) development of new structures for high field-sensitivity, (iii) development of new magnetic granular materials with large magnetoresistance, (iv) mechanism of the high field-sensitivity in GIG structures,(v) related magnetoresistance effects in GIG structures and (vi) development of actual GIG devices. By optimizing GIG structures, the magnitude and field-sensitivity of tunnel magnetoresistance are improved. This result is useful for preparing actual GIG devices. Concerning new materials, the largest room-temperature magnetoresistance has been found in CoFe-fluoride granular films, indicating that fluoride is a good barrier material for tunnel magnetoresistance. As a related magnetoresistance effect, enhanced magnetoresistance due to spin dependent single electron tunneling is observed at low temperatures in nanometer-sized GIG structures. Additionally, optimization of the electrical circuit for GIG sensors has been performed.

当前，磁性传感器一直是重要的设备，实际上用于许多系统和目的。磁性颗粒薄膜是适用于磁性传感器的最重要材料之一，因为它可以通过常规的溅射技术轻松制成。此外，在几个软磁合金电极之间将磁性颗粒膜放在磁性颗粒膜中的颗粒状（GIG）结构中达到了极好的现场敏感性。在这项研究中，我们已经研究了（i）（i）优化的零件结构，（ii）新的结构的新结构，以开发新的磁性，（III）的新型机构，（III）的型号（iiiiiv of new Magniv of Magniv of Magniv of Magniv of Magniv of（iiiiiv of）（iiiiiv of（iiiiiv of）（iiiiiv of（iiiiiv of）（iiiiiv of（ii） GIG结构中的现场敏感性，（V）与GIG结构中相关的磁势效应以及（VI）实际GIG设备的开发。通过优化GIG结构，提高了隧道磁磁性的幅度和磁化率。该结果对于准备实际的演出设备很有用。关于新材料，在CoFe-Fluoride颗粒膜中发现了最大的室温磁倍率，这表明氟化物是用于隧道磁力障碍的良好屏障材料。作为相关的磁化效果，在纳米尺寸的GIG结构中，在低温下观察到由于自旋依赖的单电子隧穿而引起的磁倍率增强。另外，已经对GIG传感器进行了优化。