Development of ultra-wideband magnetic imaging method using sensitive superparamagnetic tip and its application to evaluate soft magnetic materials

2023 Fiscal Year Final Research Report

• Project/Area Number: 21H01357
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 21050:Electric and electronic materials-related
• Research Institution: Akita University
• Principal Investigator: Saito Hitoshi 秋田大学, 理工学研究科, 教授 (00270843)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 交番磁気力顕微鏡 / 超常磁性探針 / ソフト磁性材料 / 磁区構造 / 磁壁移動 / 磁化回転

Outline of Final Research Achievements

Soft magnetic materials are widely used in a wide range of applications, from magnetic cores for electric motors and transformers for energy applications to high-density magnetic storage and high-sensitivity sensors for magnetic device applications. To contribute to research and development of these materials, we have developed an ultra-wideband magnetic imaging method that combines a high spatial resolution of less than 10 nm and a wide frequency band from direct current to several tens of GHz, using the principal investigator's proprietary technology of an alternating magnetic force microscopy and a high magnetization superparamagnetic tip.
Using this method, it becomes possible to microscopically image the magnetic domain structure of soft magnetic materials and the magnetization process caused by domain wall motion and magnetization rotation caused by the application of an alternating magnetic field.

Free Research Field

磁気工学

Academic Significance and Societal Importance of the Research Achievements

学術的意義は、従来は皆無であった、高い空間分解能と時間分解能を合わせ持ち、かつソフト磁性材料の実際の使用形態に近い状態で観察可能な汎用性に優れる磁気イメージング手法を開発したことである。
社会的意義は、エネルギー分野から磁気デバイス分野まで広い領域で多量に使用され莫大な電力を消費しているソフト磁性材料に対して、その高性能化と省エネ化を進めるうえで有用となる、磁区構造や磁化過程の微視的観察手法を開発したことである。