CAREER: Probing the Nature of Coupled Ground States in Single Crystals of Magnetoelectric Perovskite Oxides

这一学院早期职业奖支持一个项目，该项目旨在合成和研究一种名为磁电多铁材料的新材料。这些材料可能会在自旋基电子设备中找到未来的应用。此外，由于磁电材料在频域附近有电偶极子和磁偶极子共振，因此有可能实现本征远红外负折射率材料(NIM)。新的磁电材料将以大块单晶和其他形式从浮动区生长出来。将使用一系列探测器在从超低温到室温以上的广泛温度范围内研究晶格、磁性和电子结构以及磁性，其中一些是通过合作访问的。其中包括X射线衍射法、磁强计、超声波传播和中子衍射法。这些研究将导致详细的电子相图的阐明。将在国家同步加速器设施中进行额外的研究，以增加我们对这些高度绝缘化合物中磁性存在的了解。我们将使用超快时间分辨MOKE和拉曼技术来研究飞秒时间尺度上的电荷和自旋动力学。一个新的固体物理综合课程将使用一个创新的实验室实施，该课程的学生稍后将获得当地行业的实习机会。AP周边学校的物理老师将和他们的学生一起参加研究活动。通过与该大学儿童学院计划的合作，来自代表性不足群体的初中生和高中生将获得津贴，参加高中学者在物理科学方面的暑期研讨会。此外，还将为科学袋创建一个节目，这是该机构非常受欢迎的周五晚上魔术表演风格的讲座传统，向密尔沃基社区开放。%铁电材料通常是一种电绝缘体，在特定条件下可以自发地分离其正负电荷，从而产生所谓的“电偶极矩”。这类似于条形磁铁。然而，这种“棒”显示的不是磁场，而是电场。铁电材料通常不是磁性的。独立地，磁性材料和铁电材料都在现代数字记录介质和存储设备中得到广泛使用。该学院早期职业奖支持一项研究磁电多铁体材料新相的项目。人们发现这些材料在同一种材料中既表现出磁性，又表现出铁电性。在某些条件下，施加电压可能会改变--甚至颠倒--晶体中自发磁化的方向(即，电压可能会导致磁性“北极”的方向改变)。一种物质的磁化强度取决于一种叫做“自旋”的量。因此，这些材料可能会在未来的电子设备中找到应用，这些电子设备依赖于“自旋”而不是电子电荷。新的磁电材料将以块状单晶和其他形式生长。这些新材料将通过各种实验技术进行研究，以阐明它们的性质。这些研究将加深对磁性和铁电性的理解。一个新的固体物理综合课程将使用一个创新的实验室实施，该课程的学生稍后将获得当地行业的实习机会。AP周边学校的物理老师将和他们的学生一起参加研究活动。通过与该大学儿童学院计划的合作，来自代表性不足群体的初中生和高中生将获得津贴，参加高中学者在物理科学方面的暑期研讨会。此外，还将为科学袋创建一个节目，这是该机构非常受欢迎的周五晚上魔术表演风格的讲座传统，向密尔沃基社区开放。

This Faculty Early Career Award supports a project to synthesize and study a new class of materials called magnetoelectric multiferroics.. These materials may find future applications in spin-based electronic devices. In addition, with their nearby electric and magnetic dipole resonances in the frequency domain magnetoelectrics have the potential for realizing intrinsic far-infrared negative index materials (NIM). New magnetoelectric materials will be grown from a floating zone as bulk single crystals and in other forms. Lattice, magnetic, and, electronic structure as well as magnetic properties will be studied over a wide temperature range from ultra-low temperatures to above room temperature using an array of probes, some being accessed through collaborations. These include x-ray diffractometry, magnetometry, ultrasonic propagation and neutron diffraction. These studies will lead to the elucidation of detailed electronic phase diagrams. Additional studies at national synchrotron facilities will be undertaken to increase our understanding of the existence of magnetism in these highly insulating compounds. Charge and spin dynamics at femtosecond time scales will be studied using ultrafast time-resolved MOKE and Raman techniques. A new integrated curriculum in Solid State Physics will be implemented using an innovative laboratory, and students from this course will later obtain internships at local industries. AP Physics teachers from surrounding schools, along with their students, will participate in research activities. Through a partnership with the university's College for Kids program middle and high school students from under-represented groups will be provided stipends to participate in a High School Scholars summer workshop in the Physical Sciences. In addition a program will be created for the Science Bag, a highly popular Friday night magic-show style lecture tradition at the institution, open to the Milwaukee community.%%%A ferroelectric material is generally an electrical insulator that under certain conditions can spontaneously separate its positive and negative charges and thereby develop what is call an "electric dipole moment." This is similar to a bar magnet. However, instead of exhibiting a magnetic field, this "bar" exhibits an electric field. Ferroelectric materials are not usually magnetic. Independently, both magnetic materials and ferroelectric materials find extensive use in modern digital recording media and in memory devices. This Faculty Early Career Award supports a project to investigate new phases of a class of materials called magnetoelectric multiferroics. These materials are found to display both magnetism and ferroelectricity in the same material. Under certain conditions, the application of a voltage could change - or even reverse - the direction of spontaneous magnetization (i.e. an electrical voltage could cause a change in the direction of the magnetic "North pole") in the crystal. The magnetization of a material depends upon a quantity called "spin." Thus these materials may find future applications in electronic devices that depend on the "spin" rather than the electronic charge. New magnetoelectric materials will be grown in bulk single crystals and other forms. These new materials will be studied by a wide variety of experimental techniques elucidate their properties. These studies will deepen the understanding of both magnetism and ferroelectricity. A new integrated curriculum in Solid State Physics will be implemented using an innovative laboratory, and students from this course will later obtain internships at local industries. AP Physics teachers from surrounding schools, along with their students, will participate in research activities. Through a partnership with the university's College for Kids program middle and high school students from under-represented groups will be provided stipends to participate in a High School Scholars summer workshop in the Physical Sciences. In addition a program will be created for the Science Bag, a highly popular Friday night magic-show style lecture tradition at the institution, open to the Milwaukee community.