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题目（Title）：
Exploring Exchange Bias Through High-Pressure Synthesis of Double Perovskites
主讲人（Speaker）：
Kazunari Yamaura（山浦一成）
开始时间（Start Time）：
2025-05-28 14:00
结束时间（End Time）：
2025-05-28 15:00
报告地点（Place）：
物质学院5-105报告厅
主办单位（Organization）：
物质科学与技术学院
协办单位(Co-organizer)：
简介（Brief Introduction）：
报告人简介：
Kazunari Yamaura is Group Leader of the Quantum Solid State Materials Group at the Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Japan. He received his Doctorate in Chemistry from Kyoto University and currently holds a concurrent appointment as Guest Professor at Hokkaido University.
His research is centered on the synthesis and characterization of functional bulk materials, with a focus on quantum phenomena and spintronic applications. He is also committed to the development of early-career researchers through the NIMS–Hokkaido University Joint Graduate School Program.
讲座摘要：
Recent advances in bulk magnetic materials have uncovered a new class of double perovskites that exhibit robust exchange-bias-like (EB-like) behavior without relying on conventional ferromagnetic/antiferromagnetic interfaces. In this talk, he will present our latest findings on two systems: Cd2FeOsO6 and Ln2NiIrO6 (Ln = Lu, Sm), both synthesized under high-pressure conditions. Cd2FeOsO6 shows a strong EB effect near room temperature with a small cooling field of just 80 Oe, attributed to ferrimagnetic ordering, partial B-site ordering, and strong spin–orbit coupling of Os. In parallel, Lu2NiIrO6 and Sm2NiIrO6 exhibit record-high EB-like fields up to 28.2 kOe under a 1 kOe cooling field, along with large coercivity, vertical magnetization shifts, and a soft-to-hard magnetic crossover. First-principles calculations support the presence of large magnetic anisotropy in these Ni–Ir systems, stabilized by rare-earth A-site ions and Ir4+ spin–orbit coupling. Together, these results point to a promising pathway for developing single-phase, interface-free materials for low-field-controlled spintronic and magnetoresistive applications.
邀请人：郭艳峰，李军
Kazunari Yamaura is Group Leader of the Quantum Solid State Materials Group at the Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Japan. He received his Doctorate in Chemistry from Kyoto University and currently holds a concurrent appointment as Guest Professor at Hokkaido University.
His research is centered on the synthesis and characterization of functional bulk materials, with a focus on quantum phenomena and spintronic applications. He is also committed to the development of early-career researchers through the NIMS–Hokkaido University Joint Graduate School Program.
讲座摘要：
Recent advances in bulk magnetic materials have uncovered a new class of double perovskites that exhibit robust exchange-bias-like (EB-like) behavior without relying on conventional ferromagnetic/antiferromagnetic interfaces. In this talk, he will present our latest findings on two systems: Cd2FeOsO6 and Ln2NiIrO6 (Ln = Lu, Sm), both synthesized under high-pressure conditions. Cd2FeOsO6 shows a strong EB effect near room temperature with a small cooling field of just 80 Oe, attributed to ferrimagnetic ordering, partial B-site ordering, and strong spin–orbit coupling of Os. In parallel, Lu2NiIrO6 and Sm2NiIrO6 exhibit record-high EB-like fields up to 28.2 kOe under a 1 kOe cooling field, along with large coercivity, vertical magnetization shifts, and a soft-to-hard magnetic crossover. First-principles calculations support the presence of large magnetic anisotropy in these Ni–Ir systems, stabilized by rare-earth A-site ions and Ir4+ spin–orbit coupling. Together, these results point to a promising pathway for developing single-phase, interface-free materials for low-field-controlled spintronic and magnetoresistive applications.
邀请人：郭艳峰，李军
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