发表机构
Tsinghua University; Cornell University; Ningbo Institute of Digital Twin, Eastern Institute of Technology; Department of Physics, Tsinghua University; Department of Physics, University of Science and Technology of China; University at Buffalo, State University of New York; Kavli Institute at Cornell for Nanoscale Science（清华大学; 康奈尔大学; 宁波数字孪生研究院，东方理工学院; 清华大学物理系; 中国科学技术大学物理系; 纽约州立大学布法罗分校; 康奈尔纳米科学卡弗里研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究在多铁性BiFeO3中实现室温铁电切换的奇宇称磁振子自旋劈裂，通过输运指纹验证理论，并用于无场切换垂直铁磁体及XNOR逻辑内存计算。
AI 中文摘要
磁对称性可以在动量空间中提升自旋简并而不产生净磁化，从而生成按动量反转下的宇称分类的自旋纹理。偶宇称纹理已在交变磁体中确立。奇宇称自旋纹理最近在补偿磁体的电子能带中出现，但其在集体玻色子激发中的对应物在实验上仍未解决。磁振子为此扩展提供了天然环境，因为它们通过绝缘磁体携带自旋角动量而无伴随的电荷流。除了实现这一缺失状态外，更广泛的挑战是在室温下用电压对自旋劈裂进行编程。在此，我们报告了多铁性BiFeO3中铁电切换奇宇称磁振子自旋劈裂的室温输运证据。对称性分析和自旋波计算表明，摆线手性以动量奇函数依赖关系劈裂相反自旋的磁振子分支，并设定其符号。实验上，注入的面内极化自旋电流在传播过程中产生面外磁振子自旋分量。该分量表现出理论预测的晶体角度依赖性，并在铁电切换时反转，为自旋劈裂磁振子态提供了输运指纹。我们利用编程的磁振子自旋驱动垂直铁磁体的确定性无场切换，并演示了XNOR逻辑内存计算。我们的结果将奇宇称自旋劈裂从费米子电子态扩展到玻色子集体模式，并在室温下建立了非易失性电控制。
英文摘要
Magnetic symmetry can lift spin degeneracy in momentum space without producing net magnetization, generating spin textures classified by their parity under momentum reversal. Even-parity textures have well established in altermagnets. Odd-parity spin textures have recently emerged in electronic bands of compensated magnets, but their counterpart in collective bosonic excitations remains experimentally unresolved. Magnons provide a natural setting for this extension because they carry spin angular momentum through insulating magnets without accompanying charge flow. Beyond realizing this missing state, a broader challenge is to program spin splitting with voltage at room temperature. Here we report room-temperature transport evidence for ferroelectric switching odd-parity magnon spin splitting in multiferroic BiFeO3. Symmetry analysis and spin-wave calculations reveal that the cycloidal chirality splits opposite-spin magnon branches with an odd-in-momentum dependence and sets the sign. Experimentally, an injected in-plane-polarized spin current generates an out-of-plane magnon spin component during propagation. This component exhibits the crystalline angular dependence predicted by theory and reverses upon ferroelectric switching, providing a transport fingerprint of the spin-split magnon state. We use the programmed magnon spin to drive deterministic field-free switching of a perpendicular ferromagnet and demonstrate XNOR logic-in-memory. Our results extend odd-parity spin splitting from fermionic electronic states to bosonic collective modes and establish nonvolatile electrical control at room temperature.
