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Modulating Magnetism in Ferroelectric Polymer-Gated Perovskite Manganite Films with Moderate Gate Pulse Chains
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-12-06 , DOI: 10.1021/acsami.0c14172 Hon Fai Wong 1 , Sheung Mei Ng 1 , Wen Zhang 2, 3 , Yu Kuai Liu 1 , Ping Kwan Johnny Wong 2, 4 , Chi Sin Tang 3 , Ka Kin Lam 1 , Xu Wen Zhao 1 , Zhen Gong Meng 5 , Lin Feng Fei 1 , Wang Fai Cheng 1 , Danny von Nordheim 6 , Wai Yeung Wong 7 , Zong Rong Wang 8 , Bernd Ploss 6 , Ji-Yan Dai 1 , Chee Leung Mak 1 , Andrew Thye Shen Wee 3, 4 , Chi Wah Leung 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-12-06 , DOI: 10.1021/acsami.0c14172 Hon Fai Wong 1 , Sheung Mei Ng 1 , Wen Zhang 2, 3 , Yu Kuai Liu 1 , Ping Kwan Johnny Wong 2, 4 , Chi Sin Tang 3 , Ka Kin Lam 1 , Xu Wen Zhao 1 , Zhen Gong Meng 5 , Lin Feng Fei 1 , Wang Fai Cheng 1 , Danny von Nordheim 6 , Wai Yeung Wong 7 , Zong Rong Wang 8 , Bernd Ploss 6 , Ji-Yan Dai 1 , Chee Leung Mak 1 , Andrew Thye Shen Wee 3, 4 , Chi Wah Leung 1
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Most previous attempts on achieving electric-field manipulation of ferromagnetism in complex oxides, such as La0.66Sr0.33MnO3 (LSMO), are based on electrostatically induced charge carrier changes through high-k dielectrics or ferroelectrics. Here, the use of a ferroelectric copolymer, polyvinylidene fluoride with trifluoroethylene [P(VDF-TrFE)], as a gate dielectric to successfully modulate the ferromagnetism of the LSMO thin film in a field-effect device geometry is demonstrated. Specifically, through the application of low-voltage pulse chains inadequate to switch the electric dipoles of the copolymer, enhanced tunability of the oxide magnetic response is obtained, compared to that induced by ferroelectric polarization. Such observations have been attributed to electric field-induced oxygen vacancy accumulation/depletion in the LSMO layer upon the application of pulse chains, which is supported by surface-sensitive-characterization techniques, including X-ray photoelectron spectroscopy and X-ray magnetic circular dichroism. These techniques not only unveil the electrochemical nature of the mechanism but also establish a direct correlation between the oxygen vacancies created and subsequent changes to the valence states of Mn ions in LSMO. These demonstrations based on the pulsing strategy can be a viable route equally applicable to other functional oxides for the construction of electric field-controlled magnetic devices.
中文翻译：
具有中等栅极脉冲链的铁电聚合物门控钙钛矿锰矿薄膜中的磁性调制。
以前在复合氧化物中实现铁磁性的电场操纵的大多数尝试，例如La 0.66 Sr 0.33 MnO 3（LSMO），都是基于高k值引起的静电感应载流子变化。电介质或铁电体。在此，证明了使用铁电共聚物，聚偏二氟乙烯和三氟乙烯[P（VDF-TrFE）]作为栅极电介质，成功地在场效应器件的几何形状中调制LSMO薄膜的铁磁性。具体地说，通过施加不足以切换共聚物电偶极子的低压脉冲链，与铁电极化相比，可以获得更高的氧化物磁响应可调性。这些观察结果归因于在施加脉冲链后LSMO层中电场诱导的氧空位积累/耗竭，这由表面敏感性表征技术（包括X射线光电子能谱和X射线磁性圆二色性）支持。这些技术不仅揭示了机理的电化学性质，而且还建立了所产生的氧空位与随后在LSMO中Mn离子的价态变化之间的直接相关性。这些基于脉冲策略的演示可以是一条可行的途径，同样适用于其他功能氧化物，用于构建电场控制的磁性设备。
更新日期：2020-12-16
中文翻译：
具有中等栅极脉冲链的铁电聚合物门控钙钛矿锰矿薄膜中的磁性调制。
以前在复合氧化物中实现铁磁性的电场操纵的大多数尝试，例如La 0.66 Sr 0.33 MnO 3（LSMO），都是基于高k值引起的静电感应载流子变化。电介质或铁电体。在此，证明了使用铁电共聚物，聚偏二氟乙烯和三氟乙烯[P（VDF-TrFE）]作为栅极电介质，成功地在场效应器件的几何形状中调制LSMO薄膜的铁磁性。具体地说，通过施加不足以切换共聚物电偶极子的低压脉冲链，与铁电极化相比，可以获得更高的氧化物磁响应可调性。这些观察结果归因于在施加脉冲链后LSMO层中电场诱导的氧空位积累/耗竭，这由表面敏感性表征技术（包括X射线光电子能谱和X射线磁性圆二色性）支持。这些技术不仅揭示了机理的电化学性质，而且还建立了所产生的氧空位与随后在LSMO中Mn离子的价态变化之间的直接相关性。这些基于脉冲策略的演示可以是一条可行的途径，同样适用于其他功能氧化物，用于构建电场控制的磁性设备。
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