Macroscopic Quantum Effects in Nanometer-Scale Magnets
Macroscopic Quantum Effects in Nanometer-Scale Magnets
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DOI：
10.1126/science.258.5081.414
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发表时间：
1992-10
期刊：
影响因子：
56.9
通讯作者：
D. Awschalom;D. DiVincenzo;J. Smyth
中科院分区：
文献类型：
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作者：
D. Awschalom;D. DiVincenzo;J. Smyth
量子隧穿，即微观系统通过经典禁止的路径从一个状态到另一个状态的通道，在宏观世界中理论上是可能的。人们现在可以在非常小的磁结构中直接观察这种宏观量子隧穿。这是可能的，因为在获得几乎任何所需尺寸、形状和成分的磁系统的能力以及用于检测极弱磁信号的超导仪器的开发方面都取得了重大进展。作为一个例子，磁性马脾铁蛋白的测量与量子隧道理论的预测进行了讨论和显示。
Quantum tunneling, the passage of a microscopic system from one state to another by way of a classically forbidden path, is theoretically possible in the macroscopic world. One can now make direct observations of such macroscopic quantum tunneling in very small magnetic structures. This is possible because of significant advances both in the ability to obtain magnetic systems of almost any desirable size, shape, and composition and in the development of superconducting instrumentation for the detection of extremely weak magnetic signals. As an example, measurements on magnetic horse spleen ferritin proteins with the predictions of quantum tunneling theory are discussed and shown.