Using the ultra low damping NiMnSb half-Heusler alloy patterned into vortex-state magnetic nano-dots, we demonstrate a new concept of non-volatile memory controlled by the frequency. A perpendicular bias magnetic field is used to split the frequency of the vortex core gyrotropic rotation into two distinct frequencies, depending on the sign of the vortex core polarity $p=\pm1$ inside the dot. A magnetic resonance force microscope and microwave pulses applied at one of these two resonant frequencies allow for local and deterministic addressing of binary information (core polarity).
Memory-bit selective recording in vortex-core cross-point architecture
在我们早期的工作中[Appl. Phys. Lett. 92，022509（2008）]，我们提出了基于能量稳定的涡旋芯磁化的双重基态作为信息载体的非易失性涡旋随机存取存储器（VRAM）。在这里，我们通过实验证明了可靠的存储器位选择和低功耗记录在一个两个两个涡旋状态点阵列。位选择和核心切换是通过使电流沿着在其它交叉电极中选择的两个正交寻址电极线流动来进行的。定制的脉冲型旋转磁场用于仅在两个正交电极的交叉处有效地切换涡核。这种鲁棒的机制在潜在的VRAM器件中提供可靠的位选择和信息写入操作。
Vortex-Controlled Quasiparticle Multiplication and Self-Growth Dynamics in Superconducting Resonators
Ames National Laboratory（艾姆斯国家实验室）；Iowa State University（爱荷华州立大学）；Northwestern University（西北大学）；University of Alabama at Birmingham（阿拉巴马大学伯明翰分校）；Fermi National Accelerator Laboratory（费米国家加速器实验室）
