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Large Magnetoelectric Effects in Electrodeposited Nanoporous Microdisks Driven by Effective Surface Charging and Magneto-Ionics
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-12-06 00:00:00 , DOI: 10.1021/acsami.8b17442 Cristina Navarro-Senent 1 , Jordina Fornell 1 , Eloy Isarain-Chávez 1 , Alberto Quintana 1 , Enric Menéndez 1 , Michael Foerster 2 , Lucía Aballe 2 , Eugen Weschke 3 , Josep Nogués 4, 5 , Eva Pellicer 1 , Jordi Sort 1, 5
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-12-06 00:00:00 , DOI: 10.1021/acsami.8b17442 Cristina Navarro-Senent 1 , Jordina Fornell 1 , Eloy Isarain-Chávez 1 , Alberto Quintana 1 , Enric Menéndez 1 , Michael Foerster 2 , Lucía Aballe 2 , Eugen Weschke 3 , Josep Nogués 4, 5 , Eva Pellicer 1 , Jordi Sort 1, 5
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A synergetic approach to enhance magnetoelectric effects (i.e., control of magnetism with voltage) and improve energy efficiency in magnetically actuated devices is presented. The investigated material consists of an ordered array of Co–Pt microdisks, in which nanoporosity and partial oxidation are introduced during the synthetic procedure to synergetically boost the effects of electric field. The microdisks are grown by electrodeposition from an electrolyte containing an amphiphilic polymeric surfactant. The bath formulation is designed to favor the incorporation of oxygen in the form of cobalt oxide. A pronounced reduction of coercivity (88%) and a remarkable increase of Kerr signal amplitude (60%) are observed at room temperature upon subjecting the microdisks to negative voltages through an electrical double layer. These large voltage-induced changes in the magnetic properties of the microdisks are due to (i) the high surface-area-to-volume ratio with ultranarrow pore walls (sub-10 nm) that promote enhanced electric charge accumulation and (ii) magneto-ionic effects, where voltage-driven O2– migration promotes a partial reduction of CoO to Co at room temperature. This simple and versatile procedure to fabricate patterned “nano-in-micro” magnetic motifs with adjustable voltage-driven magnetic properties is very appealing for energy-efficient magnetic recording systems and other magnetoelectronic devices.
中文翻译：
有效表面充电和磁离子驱动的电沉积纳米孔微磁盘中的大磁电效应。
提出了一种协同方法来增强磁电效应（即，用电压控制磁性）并提高磁致动装置中的能量效率。被研究的材料由有序排列的Co-Pt微型磁盘组成，其中在合成过程中引入了纳米孔隙和部分氧化，以协同增强电场效应。通过从包含两亲聚合物表面活性剂的电解质中进行电沉积来生长微盘。该浴配方设计成有利于以氧化钴形式引入氧气。在微盘上通过双电层施加负电压后，在室温下观察到矫顽力显着降低（88％）和Kerr信号幅度显着增加（60％）。2 –迁移促进了室温下CoO部分还原为Co。这种用于制造具有可调电压驱动磁性能的图案化“纳米微”磁图形的简单而通用的程序，对于节能磁记录系统和其他磁电子设备非常有吸引力。
更新日期：2018-12-06
中文翻译：
有效表面充电和磁离子驱动的电沉积纳米孔微磁盘中的大磁电效应。
提出了一种协同方法来增强磁电效应（即，用电压控制磁性）并提高磁致动装置中的能量效率。被研究的材料由有序排列的Co-Pt微型磁盘组成，其中在合成过程中引入了纳米孔隙和部分氧化，以协同增强电场效应。通过从包含两亲聚合物表面活性剂的电解质中进行电沉积来生长微盘。该浴配方设计成有利于以氧化钴形式引入氧气。在微盘上通过双电层施加负电压后，在室温下观察到矫顽力显着降低（88％）和Kerr信号幅度显着增加（60％）。2 –迁移促进了室温下CoO部分还原为Co。这种用于制造具有可调电压驱动磁性能的图案化“纳米微”磁图形的简单而通用的程序，对于节能磁记录系统和其他磁电子设备非常有吸引力。
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