论文标题
弱铁磁症与ybacufeo的高温螺旋相有关。
Weak ferromagnetism linked to the high-temperature spiral phase of YBaCuFeO5
论文作者
论文摘要
层状钙钛矿Ybacufeo5是循环螺旋磁体的罕见例子，通过调节结构中的Cu2+/Fe3+化学障碍的程度，可以将其排序温度远远超出室温。这种不寻常的属性使该材料成为最有前途的自旋驱动的多效候选者之一。但是，对于螺旋对磁场的响应知之甚少，这对于磁电跨控制应用至关重要。使用最多9吨的磁场下的块状磁化和中子粉末衍射测量，我们在这里报告了该材料的第一个温度磁场相图。除了揭示螺旋状态的稳定稳定性外，我们的数据还发现了与螺旋调节共存的弱铁磁症的存在。由于可以轻松地用磁场来操纵铁磁铁，因此这种观察为控制螺旋取向的新观点提供了新的观点，直接与极化方向联系在一起，以及在技术应用中可能使用该材料的未来使用。
The layered perovskite YBaCuFeO5 is a rare example of cycloidal spiral magnet whose ordering temperature Tspiral can be tuned far beyond room temperature by adjusting the degree of Cu2+/Fe3+ chemical disorder in the structure. This unusual property qualifies this material as one of the most promising spin-driven multiferroic candidates. However, very little is known about the response of the spiral to magnetic fields, crucial for magnetoelectric cross-control applications. Using bulk magnetization and neutron powder diffraction measurements under magnetic fields up to 9 T we report here the first temperature-magnetic field phase diagram of this material. Besides revealing a strong stability of the spiral state, our data uncover the presence of weak ferromagnetism coexisting with the spiral modulation. Since ferromagnets can be easily manipulated with magnetic fields, this observation opens new perspectives for the control of the spiral orientation, directly linked to the polarization direction, as well as for a possible future use of this material in technological applications.
