由鐵（Fe）和銠（Rh）合金FeRh產生的量子自旋泵。

 

打破量子力學和自旋電子學的界限

產生比現有方式高出10倍以上的自旋電流

KAIST和西江大學共同研究，期待開發新一代電子元件

(韓國=KTN)金道亨(音)記者=KAIST李京鎮(音)、金甲鎮(音)教授和西江大學鄭明和(音)教授共同研究組在世界上首次在常溫下發現了量子力學的自旋泵現象,並提出了克服現有量子技術侷限的新可能性。

科學技術信息通訊部(部長劉相任,以下簡稱"科學技術情報通信部")表示,此次研究得到科學技術情報通信部基礎研究事業(中堅研究、基礎研究室)等支援進行,研究成果於1月30日(當地時間1月29日16時,GMT)刊登在國際學術雜誌《自然》上。

自旋電子學技術發展的新里程碑

電子設備的工作原理是基於電荷電流,但由於電流流動時產生的熱量,存在效率低下和能源消耗增加的問題。 爲了解決這一問題，全世界研究組正在研究利用自旋電流代替電荷電流的電子元件開發，這被稱爲"自旋電子學(spintronics)"技術。

自旋電流產生的代表性方法之一的自旋泵送(spin pumping)是通過磁性體和非磁性體的結合,旋轉移動的現象。 但是,現有方式產生的自旋電流體積小,實用性低。 對此,共同研究組以新的方式製作了高質量的鐵(Fe)-銠(Rh)磁性薄膜,成功觀測到了大自旋電流。

室溫下的量子力學自旋泵送觀測

量子力學現象一般只在極低溫下觀測到,但此次研究首次證明了常溫下也會出現自旋泵現象。 研究組提出了生成比現有古典力學方式高10倍以上的自旋電流的方法,爲新一代電子元件的開發找到了重要的突破口。

 

經典力學自旋泵浦(a)和量子力學自旋泵浦(b)概略圖

特別是,此次研究與自旋電子學領域的現有研究以古典自旋運動爲基礎不同,利用自旋的量子特性,證明了更有效的應用可能性,因此具有重大意義。

合作研究創造的世界性成果

此次研究是KAIST和西江大學研究組合作取得的成果,鄭明華(音)教授組發展了磁性薄膜製作技術,實現了高品質的磁性薄膜,金甲鎮(音)教授組利用這些技術觀測了自旋電流。 另外,李京鎮(音)教授組以量子力學理論爲基礎,分析實驗結果,並通過追加實驗成功進行了驗證。

 

共同通訊作者:李京鎮教授，金甲鎮教授，鄭明和教授

共同第一作者:李澤賢博士，樸敏泰博士

共同研究組表示:"此次研究與以往的研究利用古典力學自旋運動不同,利用自旋的量子特性擴大應用可能性,意義重大","期待以此次成果爲基礎,爲新一代自旋電子技術的發展做出貢獻"

break the boundaries between quantum mechanics and spintronics

Generating spin current more than 10x higher than traditional methods

KAIST-Seogang University joint research is expected to develop next-generation electronic devices

(National = KTN) Reporter Kim Do-hyung = A joint research team led by KAIST professors Lee Kyung-jin and Kim Gap-jin and Sogang University professor Chung Myung-hwa discovered the quantum mechanical spin pumping phenomenon at room temperature for the first time in the world, suggesting a new possibility to overcome the limitations of existing quantum technology.

The Ministry of Science and ICT (Minister Yoo Sang-im, hereinafter referred to as 'Minister of Science and ICT') announced that the research was carried out with the support of the Ministry of Science and ICT's basic research project (middle-sized research, basic research laboratory) and that the research results were published in the international journal Nature on January 30 (January 29, 16:00 GMT).

A New milestone in the advancement of spintronics technology

The principle of operation of electronic devices is based on charge current, but there are problems of reducing efficiency and increasing energy consumption due to heat generated when current flows. To solve this problem, researchers around the world are studying the development of electronic devices using spin current instead of charge current, which is called "spintronics" technology.

Spin pumping, one of the representative methods of generating spin current, is a phenomenon in which spin moves through the bonding of magnetic and non-magnetic materials. However, the spin current generated by the conventional method was small in size and was not practical. Accordingly, the joint research team succeeded in observing a large spin current by producing a high-quality iron (Fe)-rodium (Rh) magnetic thin film in a new way.

Quantum mechanical spin pumping observations at room temperature

Quantum mechanical phenomena are generally observed only at cryogenic temperatures, but this study proved for the first time that spin pumping occurs even at room temperature. The researchers have made an important breakthrough in the development of next-generation electronic devices by suggesting a method that can generate spin current more than 10 times higher than conventional classical mechanical methods.

In particular, this study is of great significance in that existing research in the field of spintronics has demonstrated more effective applicability by exploiting the quantum properties of spin, unlike those based on classical spin motion.

Global achievements from collaborative research

The research was made in collaboration between KAIST and Sogang University's research team. Professor Chung Myung-hwa's team developed magnetic thin film production technology to realize high-quality magnetic thin films, and Professor Kim Kap-jin's team used it to observe spin current. In addition, Professor Lee Kyung-jin's team succeeded in analyzing the experimental results based on quantum mechanical theory and verifying them through further experiments.

Co-corresponding authors: Professor Lee Kyung-jin, Professor Kim Gap-jin, and Professor Chung Myung-hwa

Co-first authors: Dr. Lee Taek-hyun and Dr. Park Min-tae

Unlike previous studies that used classical mechanical spin motion, this study is significant in that it expanded its applicability by using the quantum characteristics of spin, the joint research team said. "Based on this achievement, we expect to contribute to the development of next-generation spintronics technology."

 

 

 

 

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