Development of High-Performance Magnetic Refrigeration Materials by Numerical Simulations

2015 Fiscal Year Final Research Report

• Project/Area Number: 25420698
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Physical properties of metals/Metal-base materials
• Research Institution: National Institute for Materials Science
• Principal Investigator: Tamura Ryo 国立研究開発法人物質・材料研究機構, 理論計算科学ユニット, 研究員 (20636998)
• Co-Investigator(Renkei-kenkyūsha): KITAZAWA Hideaki 国立研究開発法人・物質材料研究機構, 量子ビームユニット, ユニット長 (00195257) ; TANAKA Shu 早稲田大学, 早稲田大学高等研究所, 助教 (40507836)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 磁性材料 / 磁気冷凍 / 磁気エントロピー / 磁気構造 / 不純物効果 / 圧力効果

Outline of Final Research Achievements

In order to develop new high performance magnetic refrigeration materials, we established the method to obtain the maximum magnetic refrigeration efficiency and studied the control method of the magnetic refrigeration efficiency by numerical simulations. As a result, we found that the method where the magnetic refrigeration efficiency becomes maximum is different between ferromagnetic materials and non-ferromagnetic materials. We proposed new method to obtain the maximum magnetic refrigeration efficiency for all magnetic materials. Furthermore, we showed that the magnetic refrigeration efficiency can be controlled by the impurity effect and the pressure effect. In addition, we developed the magnetic refrigeration material Ho5Pd2 which is a candidate material for low-temperature magnetic refrigeration.

Free Research Field

大規模数値計算による磁性材料研究