Injection Locking at Fractional Frequencies of Magnetic-Tunnel-Junction-Based Read Sensors’ Ferromagnetic Resonance Modes
Injection Locking at Fractional Frequencies of Magnetic-Tunnel-Junction-Based Read Sensors’ Ferromagnetic Resonance Modes
复制标题
基于磁隧道结的读取传感器的铁磁共振模式的分数频率注入锁定
DOI:
10.1103/physrevapplied.12.054022
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发表时间:
2019
影响因子:
4.6
通讯作者:
D. Berkov
中科院分区:
文献类型:
--
作者:
E. Auerbach;D. Berkov
Being nonlinear dynamic systems, magnetic read sensors should respond to an excitation signal of a frequency considerably different from their natural ferromagnetic resonance (FMR) frequencies. Because of the magnetization dynamics’ inherent nonlinear nature, the sensors’ response should be measured at the dc, excitation frequency, and its multiples (harmonics). In this paper, we present results of such measurements, accomplished using a one-port nonlinear vector network analyzer (NVNA), which show distinct resonances at fractional frequencies of the free layer (FL) FMR mode. Identification of these resonances, resulting from the nonlinear nature of the spin-torque-(ST-)induced magnetization dynamics, is performed using micromagnetic modeling. In particular, we show that the measured dc response at the above-mentioned fractional frequencies can be explained by a low-order nonlinearity and strong magnetodipolar feedback between magnetic layers adjacent to abarrier. Additionally, we determine that the simulated harmonic response is strongly enhanced by the mutual ST effect between these layers. Finally, we demonstrate that the read sensors’ nonlinear magnetization dynamics and, by extension, their harmonic response are highly sensitive to various magnetic and ST parameters. Thus, this study shows that using NVNA measurements in conjunction with micromagnetic modeling can clarify the uncertainty in the definition of these parameters.
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DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
B. Shivamoggi
通讯作者:
B. Shivamoggi
DOI:
--
发表时间:
2009
期刊:
ARFTG Microwave Measurement Conference
影响因子:
--
作者:
K. Remley
通讯作者:
K. Remley
DOI:
--
发表时间:
2010
期刊:
影响因子:
--
作者:
N. Smith;M. Carey;J. Childress
通讯作者:
J. Childress
DOI:
--
发表时间:
1988
期刊:
影响因子:
--
作者:
J. Lagnese;R. Mcknight
通讯作者:
R. Mcknight
影响因子:
3.7
作者:
Keatley P
通讯作者:
Keatley P