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Xu Lab
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The lab uses magnetic transformations and martensitic transformations to create shape memory alloys and magnetic materials.
AboutAbout the lab
Controlling atomic arrangements to give metals new properties.
The Xu Lab conducts fundamental research on controlling the microstructure of materials by making use of phase stability and phase transformations in metals.
Even with the same composition, a metal's strength and magnetic properties change greatly when its microstructure, such as crystal orientation or grain size, changes.
Focusing on how magnetic transformation, order-disorder transformation, and martensitic transformation affect one another, the lab aims to develop shape memory materials and magnetic materials.
Based on phase diagrams, the lab carries out everything within the lab, from alloy making to microstructure analysis and property evaluation.
Key terms
- Phase transformation
- A phenomenon in which a material changes, while keeping the same chemical composition, to a state (phase) with a different atomic arrangement or different physical properties
- Martensitic transformation
- A phase transformation in which atoms move all at once while keeping their positional relationships with one another. It is the basis of the shape memory effect
- Magnetostriction
- A phenomenon in which the dimensions of a material change slightly when a magnetic field is applied. It is used in sensors and other devices
NewsLab news
Associate Professor Xiao Xu received the 7th High Magnetic Field Forum Frontier Encouragement Award
Associate Professor Xiao Xu received the CRC-MS Award 2024
ResearchResearch themes
Based on phase diagrams and the thermodynamics of microstructures, the lab aims to control the microstructure of metals and create materials that have never existed before. In particular, it focuses on the relationship between magnetic transformation and martensitic transformation, and studies shape memory materials and magnetic materials.
*Illustrative imageMagnetic Shape Memory Alloys
By adding magnetism as a further degree of freedom to shape memory alloys, the lab studies materials whose strain can be controlled with a magnetic field. They are expected to be used as high-performance actuators and sensors.
*Illustrative imageDevelopment of High-Performance Magnetostrictive Materials
Magnetostriction, in which dimensions change when a magnetic field is applied, is expected to find applications in a wide range of fields as actuators, sensors, and energy harvesting materials. Focusing on Fe-based, Ni-based, and Co-based metallic materials, the lab works on improving performance and developing new materials.
*Illustrative imageLow-Cost, High-Performance Mn-Based Magnets
Permanent magnets include inexpensive ferrite magnets and high-performance rare-earth magnets, and demand is growing for the development of Mn-based magnets to fill the gap between them. Through fundamental research on equilibrium phase diagrams of Mn-based alloys and the magnetic properties of intermetallic compounds, the lab aims to create new magnets.
*Illustrative imageHeusler Alloys and Spintronics Materials
Targeting Heusler alloys, which have half-metallic properties, the lab collects fundamental data such as phase equilibria and magnetic properties. It works on developing new spintronics materials that combine excellent half-metallicity with high phase stability.
MembersFaculty
The Xu Lab consists of faculty members, postdoctoral researchers, doctoral, master's, and undergraduate students, and research students.As of 2025
- Associate ProfessorXiao Xu
- Project Assistant ProfessorJi Xia
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “EBSD orientation map of ferrous lath martensite” Tiberio / CC BY-SA 4.0 (cropped)
- Magnetic Shape Memory Alloys: “Memory Spring Quadrat” DaniSMI / CC BY-SA 4.0 (cropped)
- Development of High-Performance Magnetostrictive Materials: “Magnetostrictive transducer” derivative work: Zureks (talk) Transducteur_magnetostrictif_annote.png: User:Syntex / Public domain (cropped)
- Low-Cost, High-Performance Mn-Based Magnets: “Magnetron magnet” Chetvorno / CC0 (cropped)
- Heusler Alloys and Spintronics Materials: “Caly Heusler” Shrubalum / CC BY-SA 4.0 (cropped)
- Related lab (Omori-Ito Lab): “Aluminium etched” Alchemist-hp (talk) (www.pse-mendelejew.de) / CC BY-SA 2.0 de (cropped)
- Related lab (Ichitsubo Lab): “Magnesium crystals” Warut Roonguthai / CC BY-SA 3.0 (cropped)
- Related lab (Saida Lab): “U.S. Department of Energy - Science - )” U.S. Department of Energy from United States / Public domain (cropped)
- Related lab (Miyamoto Lab): “Steel truss bridge over Fiskelva river in Nordreisa, Troms og Finnmark, Norway, 2022 August” Ximonic (Simo Räsänen) / CC BY-SA 4.0 (cropped)
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