一种新型的螺旋铁-六角铁复合材料,用于在带有PZT的双轴机中增强磁电合
Sujoy Saha1, Sabita Acharya1, Maksym Popov1,2
1Department of Physics, Oakland University, Rochester, MI 48309, USA.
Sensors (Basel, Switzerland)
|December 23, 2023
概括
研究人员开发了一种用于磁电传感器的新型复合材料,可以在没有外部磁场的情况下工作. 这种新材料结合了六聚和铁,显示出强大的磁电合,用于先进的设备应用.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 纳米技术纳米技术
背景情况:
- 磁电 (ME) 效应是铁磁电复合材料中的应变介导现象,对于传感器和信号处理至关重要.
- 通常,强烈的ME合需要偏向磁场,限制设备小型化和实际应用.
- 开发具有内在性质的材料,如高磁阻和异质性场,是实现无外部偏差运行的ME设备的关键.
研究的目的:
- 在不需要外部磁偏差场的情况下,设计出具有强磁电效应的复合材料.
- 为了研究六 Ferrite (BaM) 和 Ferrite (NFO) 复合材料 (BNx) 的性能,用于增强磁电合.
- 为了证明这些复合材料在ME设备 (如传感器和能量收获器) 中的潜力.
主要方法:
- 准备BNx复合材料,其BaM和NFO的比例不同 (x = 0-100).
- 使用X射线衍射 (XRD) 和扫描电子显微镜 (SEM) 来确认相纯度和微观结构的表征.
- 磁性特性的测量包括和磁化,磁力强化,通过磁化曲线和铁磁共振 (FMR) 确定异构电场 (HA).
- 通过将BNx复合材料与硫酸 (PZT) 结合制造双层,并在低频率和共振下测量磁电电压系数 (MEVC).
主要成果:
- 在没有杂质阶段的情况下成功合成了BNx复合材料,SEM揭示了突出的BaM粒和增加的异性质场,含有更高的NFO含量.
- 富含NFO的复合材料 (x ≥60) 呈现出高磁性阻力 (~ -23 ppm),与纯NFO相美.
- 随着NFO含量增加,异构性场 (HA) 增加,达到BN75的最大7.77kOe,作为内置偏差场.
- 在BNx-PZT双层 (x ≥33) 中观察到强烈的零偏差ME合,BN75-PZT的最高零偏差MEVC为~22mV/cmOe.
- 在BN95-PZT双层的机电共振 (59 kHz) 时,获得了992 mV/cm Oe的最大MEVC.
结论:
- 开发的BaM-NFO复合材料有效地提供了大型的平面内异构性场,使强大的磁电合在零外部磁偏差下成为可能.
- 这些复合材料对开发微型,高效的ME设备,包括能源收获器,传感器和高频应用有前途.
- 使用六聚酸盐 - 螺旋酸盐复合材料的策略为实际,无偏差的ME设备实现提供了显著的进步.
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