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首页> 外文期刊>Physical review >Magnon-phonon interconversion in a dynamically reconfigurable magnetic material
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Magnon-phonon interconversion in a dynamically reconfigurable magnetic material

机译：动态可重构磁性材料中的磁子-声子互变

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摘要

The ferrimagnetic insulator yttrium iron garnet (YIG) is an important material in the field of magnon spintronics, mainly because of its low magnetic losses. YIG also has very low acoustic losses, and for this reason the conversion of a state of magnetic excitation (magnons) into a state of lattice vibration (phonons), or vice versa, broadens its possible applications in spintronics. Since the magnetic parameters can be varied by some external action, the magnon-phonon interconversion can be tuned to perform a desired function. We present a quantum theory of the interaction between magnons and phonons in a ferromagnetic material subject to a dynamic variation of the applied magnetic field. It is shown that when the field gradient at the magnetoelastic crossover region is much smaller than a critical value, an initial elastic excitation can be completely converted into a magnetic excitation, or vice versa. This occurs with conservation of linear momentum and spin angular momentum, implying that phonons created by the conversion of magnons have spin angular momentum and carry spin current. It is shown further that if the system is initially in a quantum coherent state, its coherence properties are maintained regardless of the time dependence of the field.
机译：亚铁绝缘子钇铁石榴石（YIG）是磁振自旋电子学领域中的一种重要材料，主要是因为其磁损耗低。 YIG的声损耗也非常低，因此，将磁激发状态（磁振子）转换为晶格振动状态（声子），反之亦然，YIG扩大了其在自旋电子学中的应用范围。由于可以通过某些外部作用来改变磁参数，因此可以调整磁子-声子互变以执行所需的功能。我们提出了一种铁磁材料中的磁振子和声子之间相互作用的量子理论，该磁场受施加磁场的动态变化影响。结果表明，当磁弹性交叉区域的磁场梯度远小于临界值时，初始的弹性激励可以完全转换为磁激励，反之亦然。这是在线性动量和自旋角动量守恒的情况下发生的，这意味着由磁振子转换产生的声子具有自旋角动量并携带自旋电流。进一步示出，如果系统最初处于量子相干状态，则无论场的时间依赖性如何，都保持其相干特性。

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