Deterministic Magnetic Switching in Perpendicular Magnetic Trilayers Through Sunlight-Induced Photoelectron Injection.
Deterministic Magnetic Switching in Perpendicular Magnetic Trilayers Through Sunlight-Induced Photoelectron Injection.
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DOI：
10.1002/smll.202301955
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发表时间：
2023-03
期刊：
影响因子：
13.3
通讯作者：
Meng Zhao;Lei Wang;Yifan Zhao;Yujing Du;Zhexi He;Kai Chen;Zhenlin Luo;Wensheng Yan;Qian Li;Chenying Wang;Zhuangde Jiang;Meilin Liu;Ziyao Zhou
中科院分区：
文献类型：
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作者：
Meng Zhao;Lei Wang;Yifan Zhao;Yujing Du;Zhexi He;Kai Chen;Zhenlin Luo;Wensheng Yan;Qian Li;Chenying Wang;Zhuangde Jiang;Meilin Liu;Ziyao Zhou
在存储器等自旋电子器件中，找到一种节能的磁化转换方法是至关重要的。通常，在各种铁磁异质结构中，自旋受到自旋极化电流或电压的操纵，但它们的能量消耗相对较大。本文提出了一种能量有效的太阳光控制方法来控制铂(0.8 nm)/钴(0.65 nm)/铂(2.5 nm)/PnSi异质结的垂直磁各向异性(PMA)。在太阳光照射下，矫顽场(Hc)从261变化到95 Oe(%变化)，在140 Oe的偏磁辅助下，实现了近180°确定磁化强度的可逆切换。元素分辨X射线圆二色谱测量表明，Co层在有阳光和无阳光的情况下，L3和L2边缘信号不同，表明Co磁化过程中光电子诱导的轨道和自旋矩的重新分布。第一性原理计算还表明，光致电子移位了电子的费米能级，增强了Co/Pt界面周围的面内Rashba场，导致PMA减弱，相应的Hc减小，相应的磁化强度也相应地发生了变化。PMA的日照控制可以为磁记录提供一种替代方法，它是一种节能的方法，可以减少高开关电流产生的焦耳热量。
Finding an energy-efficient way of switching magnetization is crucial in spintronic devices, such as memories. Usually, spins are manipulated by spin-polarized currents or voltages in various ferromagnetic heterostructures; however, their energy consumption is relatively large. Here, a sunlight control of perpendicular magnetic anisotropy (PMA) in Pt (0.8 nm)/Co (0.65 nm)/Pt (2.5 nm)/PN Si heterojunction in an energy-efficient manner is proposed. The coercive field (HC ) is altered from 261 to 95 Oe (64% variation) under sunlight illumination, enabling a nearly 180° deterministic magnetization switching reversibly with a 140 Oe magnetic bias assistant. The element-resolved X-ray circular dichroism measurement reveals different L3 and L2 edge signals of the Co layer with or without sunlight, suggesting a photoelectron-induced redistribution of the orbital and spin moment in Co magnetization. The first-principle calculations also reveal that the photo-induced electrons shift the Fermi level of electrons and enhance the in-plane Rashba field around the Co/Pt interfaces, leading to a weakened PMA and corresponding HC decreasing and magnetization switching accordingly. The sunlight control of PMA may provide an alternative way for magnetic recording, which is energy efficient and would reduce the Joule heat from the high switching current.