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Energy Efficient Control of Ultrafast Spin Current to Induce Single Femtosecond Pulse Switching of a Ferromagnet
Advanced Science ( IF 14.3 ) Pub Date : 2020-10-15 , DOI: 10.1002/advs.202001996 Quentin Remy 1 , Junta Igarashi 2 , Satoshi Iihama 3, 4 , Grégory Malinowski 1 , Michel Hehn 1 , Jon Gorchon 1 , Julius Hohlfeld 1 , Shunsuke Fukami 2, 4, 5, 6, 7 , Hideo Ohno 2, 4, 5, 6, 7 , Stéphane Mangin 1
Advanced Science ( IF 14.3 ) Pub Date : 2020-10-15 , DOI: 10.1002/advs.202001996 Quentin Remy 1 , Junta Igarashi 2 , Satoshi Iihama 3, 4 , Grégory Malinowski 1 , Michel Hehn 1 , Jon Gorchon 1 , Julius Hohlfeld 1 , Shunsuke Fukami 2, 4, 5, 6, 7 , Hideo Ohno 2, 4, 5, 6, 7 , Stéphane Mangin 1
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New methods to induce magnetization switching in a thin ferromagnetic material using femtosecond laser pulses without the assistance of an applied external magnetic field have recently attracted a lot of interest. It has been shown that by optically triggering the reversal of the magnetization in a GdFeCo layer, the magnetization of a nearby ferromagnetic thin film can also be reversed via spin currents originating in the GdFeCo layer. Here, using a similar structure, it is shown that the magnetization reversal of the GdFeCo is not required in order to reverse the magnetization of the ferromagnetic thin film. This switching is attributed to the ultrafast spin current and can be generated by the GdFeCo demagnetization. A larger energy efficiency of the ferromagnetic layer single pulse switching is obtained for a GdFeCo with a larger Gd concentration. Those ultrafast and energy efficient switchings observed in such spintronic devices open a new path toward ultrafast and energy efficient magnetic memories.
中文翻译：
超快自旋电流的节能控制以诱导铁磁体的单飞秒脉冲开关
最近，使用飞秒激光脉冲在薄铁磁材料中诱导磁化转变而无需施加外部磁场的帮助的新方法引起了人们的广泛兴趣。已经表明，通过光学触发 GdFeCo 层中磁化强度的反转，附近铁磁薄膜的磁化强度也可以通过源自 GdFeCo 层的自旋电流来反转。这里，使用类似的结构，表明不需要GdFeCo的磁化反转来反转铁磁薄膜的磁化。这种切换归因于超快自旋电流，并且可以由 GdFeCo 退磁产生。Gd浓度越大，铁磁层单脉冲开关的能量效率就越高。在此类自旋电子器件中观察到的超快且节能的开关为超快且节能的磁存储器开辟了一条新的道路。
更新日期：2020-12-03
中文翻译：
超快自旋电流的节能控制以诱导铁磁体的单飞秒脉冲开关
最近，使用飞秒激光脉冲在薄铁磁材料中诱导磁化转变而无需施加外部磁场的帮助的新方法引起了人们的广泛兴趣。已经表明，通过光学触发 GdFeCo 层中磁化强度的反转，附近铁磁薄膜的磁化强度也可以通过源自 GdFeCo 层的自旋电流来反转。这里，使用类似的结构，表明不需要GdFeCo的磁化反转来反转铁磁薄膜的磁化。这种切换归因于超快自旋电流，并且可以由 GdFeCo 退磁产生。Gd浓度越大，铁磁层单脉冲开关的能量效率就越高。在此类自旋电子器件中观察到的超快且节能的开关为超快且节能的磁存储器开辟了一条新的道路。
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