Investigation of multiferroic magnetic systems by ultrasonic velocity measurements

通过超声波速度测量研究多铁磁系统

• 批准号: 227095-2012
• 负责人: Quirion, Guy
• 金额: $ 2.33万
• 依托单位: Memorial University of Newfoundland
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=523906
• 关键词: Investigation; multiferroic; magnetic; systems; ultrasonic

We are principally interested in the study of multiferroic compounds which are simultaneously antiferromagnetic, ferroelectric, and ferroelastic. Besides the fundamental scientific interest, this class of magnetoelectric materials (materials that show a coupling between their magnetic and ferroelectric properties) can potentially be used as an alternative means for controlling the magnetization in future electronic memory devices, as well as for actuators, switches, and magnetic field sensors. The interest in this field has been trigger by recent results which suggest that triangular lattice antiferromagnets, which favour non-collinear spin configuration due to magnetic frustration, are good candidates for the observation of strong magnetoelectric effects. Thus, the objective of this program of research is to investigate the magnetic, ferroelectric, and elastic properties of a series of frustrated multiferroic compounds which display ferroelectricity induced upon the stabilization of a helical magnetic structure at low or even high temperatures in the case of CuO (T = 230 K) and BiFeO3 (T = 643 K).

我们主要研究同时具有反铁磁、铁电和铁弹性质的多铁性化合物。 除了基本的科学兴趣之外，这类磁电材料（显示其磁性和铁电性之间的耦合的材料）可以潜在地用作控制未来电子存储设备以及致动器，开关和磁场传感器中的磁化的替代手段。 最近的研究结果表明，三角晶格反铁磁体，有利于非共线自旋配置，由于磁挫折，是很好的候选人，观察强磁电效应，在这一领域的兴趣已被触发。 因此，本研究计划的目的是调查的磁性，铁电性，和弹性性能的一系列受挫的多铁性化合物，显示铁电性诱导后，稳定的螺旋磁结构，在低温甚至高温的情况下，CuO（T = 230 K）和BiFeO 3（T = 643 K）。