[Tyra Talk] 04/26/2024 低能耗電子元件

能夠透過外加電場或磁場操控材料的磁性，是實現奈米電子元件的重要目標。然而隨著元件尺寸變小，能耗上升，需要有方法能夠提升能量的使用效率。此演講中，黃老師將以多鐵材料 BiFeO3 薄膜為例，說明其特性以及如何實現低能耗電子元件。

|| 講者（Speaker）:

黃彥霖(Yen-Lin Huang)
Dr. Yen-Lin Huang is an Assistant Professor of Materials Science and Engineering at National Yang Ming Chiao Tung University. He received his B.S. and M.S. in Materials Science and Engineering from National Tsing Hua University in 2009 and 2011, respectively. And he won his Ph.D. in Materials Science and Engineering from National Chiao Tung University in 2017. From 2017 to 2019, he served as a Postdoctoral Fellow in the Materials Sciences Division at Lawrence Berkeley National Laboratory. From 2019 to 2021, he worked in the Department of Corporate Research Advanced Spintronics Technology at TSMC North America as a principal engineer. As of January 2024, Dr. Huang has published > 40 papers, 10 US patents, and his work has been cited ~1900 times (resulting in an h-index = 23; i10-index = 30), and he has given ~10 invited talks during his career and serves as peer-review research journals as referee and as guest editor.

|| 摘要（Abstract）:

The key to incorporating spintronics concepts into conventional nanoelectronics lies in the ability to manipulate the magnetic order in nanoscale devices. As integrated circuits continue to shrink, controlling these tiny magnets with high energy efficiency becomes crucial. In recent decades, the oxide community has explored various materials that offer opportunities for magnetism control, with multiferroics emerging as a highly promising material family. Multiferroics are characterized by the coexistence of at least two order parameters, specifically ferroelectricity (P) and magnetism (M), which exhibit coupling between each other. In this presentation, I will discuss the mechanism of magnetoelectric switching in BiFeO3 thin films. BiFeO3 is arguably the most extensively studied multiferroic to date, showcasing robust ferroelectricity and antiferromagnetism above room temperature. Additionally, it exhibits weak ferromagnetism (MC) induced by the canted spin configuration described by the Dzyaloshinskii-Moriya interaction. Importantly, the ferroic orderings, P and MC, are strongly intertwined, allowing for magnetism switching through an electric field. However, the substantial spontaneous polarization in BiFeO3 necessitates a high voltage for switching. To overcome this challenge, we introduce multiple ways to weaken the order parameters in BiFeO3, enabling ultralow-voltage (< 500 mV) and non-volatile manipulation of ferromagnetism at room temperature. In conclusion, this presentation provides an overview of the current state of multiferroics, particularly focusing on BiFeO3, in the context of low-power electronics. Finally, I will address the existing challenges and outline future directions for multiferroics, emphasizing their potential for advancing low-power electronics.

|| 研究領域（Field）:

自然科學、數學、統計

|| 研究子領域（Sub-field）:

Spintronics

|| 主持人（Chair）:

謝明修

|| 活動時間（ Event Time）:

04/26/2024 07:00 PM PDT Pacific Time
04/26/2024 08:00 PM MDT Mountain Time
04/26/2024 09:00 PM CDT Central Time
04/26/2024 10:00 PM EDT Eastern Time
04/27/2024 03:00 AM BST England
04/27/2024 04:00 AM CEST Berlin
04/27/2024 10:00 AM Taiwan

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