Institute for Molecules and Materials, Radboud University, 135 Heyendaalseweg, 6525 AJ Nijmegen, The Netherlands.
Moscow Institute of Physics and Technology (State University), 141700 Dolgoprundy, Russia.
Phys Rev Lett. 2019 Jan 18;122(2):027202. doi: 10.1103/PhysRevLett.122.027202.
A heat-assisted route for subnanosecond magnetic recording is discovered for the dielectric bismuth-substituted yttrium iron garnet, known for possessing small magnetic damping. The experiments and simulations reveal that the route involves nonlinear magnetization precession, triggered by a transient thermal modification of the growth-induced crystalline anisotropy in the presence of a fixed perpendicular magnetic field. The pathway is rendered robust by the damping becoming anomalously large during the switching process. Subnanosecond deterministic magnetization reversal was achieved within just one-half of a precessional period, and this mechanism should be possible to implement in any material with suitably engineered dissimilar thermal derivatives of magnetization and anisotropy.
人们发现了一种热辅助亚纳秒磁记录方法，用于介电铋取代钇铁石榴石，这种材料以具有较小的磁阻尼而闻名。实验和模拟表明，该方法涉及到在存在固定垂直磁场的情况下，由生长诱导的各向异性的瞬态热改性触发的非线性磁化进动。在切换过程中阻尼异常增大，使该途径具有鲁棒性。在不到进动周期的一半时间内实现了亚纳秒确定性磁化反转，并且该机制应该可以在任何具有适当设计的磁化和各向异性的不同热导数的材料中实现。
