All-optical study of tunable ultrafast spin dynamics in [Co/Pd]/NiFe systems: the role of spin-twist structure on Gilbert damping

Banerjee Chandrima; Pal Semanti; Ahlberg Martina; Nguyen T. N. Anh; Akerman Johan; Barman Anjan

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All-optical study of tunable ultrafast spin dynamics in [Co/Pd]/NiFe systems: the role of spin-twist structure on Gilbert damping

机译：[CO / PD] / NIFE系统中可调谐超快自旋动力学的全光学研究：旋转结构对Gilbert阻尼的作用

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We investigate optically induced ultrafast magnetization dynamics in [Co(0.5 nm)/Pd(1 nm)](5)/NiFe(t) exchange-spring samples with tilted perpendicular magnetic anisotropy using a time-resolved magneto-optical Kerr effect magnetometer. The competition between the out-of-plane anisotropy of the hard layer, the in-plane anisotropy of the soft layer and the applied bias field reorganizes the spins in the soft layer, which are modified further with the variation in t. The spin-wave spectrum, the ultrafast demagnetization time, and the extracted damping coefficients - all depend on the spin distribution in the soft layer, while the latter two also depend on the spin-orbit coupling between the Co and Pd layers. The spin-wave spectra change from multimode to single-mode as t decreases. At the maximum field reached in this study, H = 2.5 kOe, the damping shows a nonmonotonic dependence on t with a minimum at t = 7.5 nm. For t < 7.5 nm, intrinsic effects dominate, whereas for t > 7.5 nm, extrinsic effects govern the damping mechanisms.

机译：我们使用时间分辨的磁光kerr效应磁力计倾斜的垂直磁各向异性，在倾斜垂直磁各向异性中调查光学诱导的超快磁化动力学（5）/ niFe（5）/ nife（5）/ niFe（5）/ niFe（5）/ niFe（5）/ niFe（5）/ niFe（5）/ niFe（5）/ niFe（5）/ nife硬层外平面各向异性之间的竞争，软层的面内各向异性和施加的偏置场重新组织软层中的旋转，其进一步与T的变化进行修改。自旋波谱，超快退磁时间和提取的阻尼系数 - 全部取决于软层中的旋转分布，而后两组也取决于CO和PD层之间的旋转轨道耦合。随着T减小，旋转波谱从多模变为单模。在本研究中达到的最大领域，H = 2.5 koe，阻尼显示出对t的非单调依赖性，最小在t = 7.5nm。对于T <7.5 nm，固有效应支配，而对于T> 7.5 nm，外部效果控制阻尼机制。

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《RSC Advances》 |2016年第83期|共6页
作者
Banerjee Chandrima; Pal Semanti; Ahlberg Martina; Nguyen T. N. Anh; Akerman Johan; Barman Anjan;
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作者单位

SN Bose Natl Ctr Basic Sci Dept Condensed Matter Phys &

Mat Sci Block JD Sec 3 Kolkata 700106 India;

SN Bose Natl Ctr Basic Sci Dept Condensed Matter Phys &

Mat Sci Block JD Sec 3 Kolkata 700106 India;

Univ Gothenburg Dept Phys S-41296 Gothenburg Sweden;

Vietnam Acad Sci &

Technol Inst Mat Sci Lab Magnetism &

Superconduct 18 Hoang Quoc Viet Hanoi Vietnam;

Univ Gothenburg Dept Phys S-41296 Gothenburg Sweden;

SN Bose Natl Ctr Basic Sci Dept Condensed Matter Phys &

Mat Sci Block JD Sec 3 Kolkata 700106 India;

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1. All-optical study of tunable ultrafast spin dynamics in [Co/Pd]/NiFe systems: the role of spin-twist structure on Gilbert damping [J] . Banerjee Chandrima, Pal Semanti, Ahlberg Martina, RSC Advances . 2016,第83期

机译：[CO / PD] / NIFE系统中可调谐超快自旋动力学的全光学研究：旋转结构对Gilbert阻尼的作用
2. Effect of the spin-twist structure on the spin-wave dynamics in Fe_(55)Pt_(45)/Ni_(80)Fe_(20) exchange coupled bi-layers with varying Ni_(80)Fe_(20) thickness [J] . Semanti Pal, Saswati Barman, Olav Hellwig, Journal of Applied Physics . 2014,第17PTa3期

机译：Ni_（80）Fe_（20）厚度变化的Fe_（55）Pt_（45）/ Ni_（80）Fe_（20）交换耦合双层中自旋扭曲结构对自旋波动力学的影响
3. Low-power, ultrafast, and dynamic all-optical tunable plasmon induced transparency in two stub resonators side-coupled with a plasmonic waveguide system [J] . Wang Boyun, Zeng Qingdong, Xiao Shuyuan, Journal of Physics, D. Applied Physics: A Europhysics Journal . 2017,第45期

机译：低功耗，超快和动态全光可调等离子体诱导的两个存根谐振器侧面与等离子体波导系统相结合
4. Effect of angle-dependent Gilbert damping due to spin pumping on the magnetization dynamics induced by spin current [C] . W. Kim, K. Lee, T. Lee Intermag Conference . 2006

机译：角度依赖性Gilbert阻尼的影响旋转泵送旋转电流磁化动力学
5. Theoretical Study of Gilbert Damping and Spin Dynamics in Spintronic Devices [D] . Qu, Tao. 2017

机译：自旋电子器件的吉尔伯特阻尼和自旋动力学的理论研究
6. Soft X-ray magnetic scattering studies of 3D magnetic morphology along buried interfaces in NiFe/CoPd/NiFe nanostructures [O] . Samuel Flewett, Thiago J. A. Mori, Alexandra Ovalle, -1

机译：NiFe / CoPd / NiFe纳米结构中沿掩埋界面的3D磁形态的软X射线磁散射研究
7. All-Optical Study of Tunable Ultrafast Spin Dynamics in [Co/Pd]-NiFe Systems: The Role of Spin-Twist Structure on Gilbert Damping [O] . Banerjee, Chandrima, Pal, Semanti, Ahlberg, Martina, 2016

机译：[Co / pd] -NiFe中可调谐超快自旋动力学的全光学研究系统：旋转扭转结构对吉尔伯特阻尼的作用

All-optical study of tunable ultrafast spin dynamics in [Co/Pd]/NiFe systems: the role of spin-twist structure on Gilbert damping

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