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Capacitance effect on the oscillation and switching characteristics of spin torque oscillators.

Zeng T, Zhou Y, Leung CW, Lai PP, Pong PW - Nanoscale Res Lett (2014)

Bottom Line: The switching characteristic is featured with the emerging of the canted region; the canted region increases with the capacitance.When the external field is absent, the STO free-layer switching time exhibits different dependences on the capacitance for different injected current.These results help to establish the foundation for capacitance-involved STO modeling.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Electrical and Electronic Engineering, The University of Hong Kong, Pokfulam, Hong Kong.

ABSTRACT
We have studied the capacitance effect on the oscillation characteristics and the switching characteristics of the spin torque oscillators (STOs). We found that when the external field is applied, the STO oscillation frequency exhibits various dependences on the capacitance for injected current ranging from 8 to 20 mA. The switching characteristic is featured with the emerging of the canted region; the canted region increases with the capacitance. When the external field is absent, the STO free-layer switching time exhibits different dependences on the capacitance for different injected current. These results help to establish the foundation for capacitance-involved STO modeling.

No MeSH data available.


Related in: MedlinePlus

Jc1, Jc2, and canted region dependence on capacitance. (a)Jc1(Boundary separating oscillation state with canted state) dependence on capacitance. (b)Jc2(Boundary separating canted states and normal complete switching from parallel to anti-parallel) dependence on capacitance. (c) Canted region (Jc2 − Jc1) dependence on capacitance.
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Figure 4: Jc1, Jc2, and canted region dependence on capacitance. (a)Jc1(Boundary separating oscillation state with canted state) dependence on capacitance. (b)Jc2(Boundary separating canted states and normal complete switching from parallel to anti-parallel) dependence on capacitance. (c) Canted region (Jc2 − Jc1) dependence on capacitance.

Mentions: The capacitance value is varied, and how the canted region evolves is explored in Figure 4. Jc1 is defined as the current boundary separating oscillation state with canted state. As shown in Figure 4a, Jc1 drastically decreases with capacitance in the range of 0.1 to 1 pF and tends to be stable with capacitance greater than 1 pF. Jc2 is defined as the current boundary separating canted state and normal complete switching from parallel to anti-parallel. As shown in Figure 4b, Jc2 increases with capacitance in a quasi-exponential tendency from 0.1 to 1 pF. This tendency is repeated for capacitance in the range of 1 to 10 pF. The difference between Jc2 and Jc1 results in the canted region as shown in Figure 4c. Obviously, the canted region maintains a positive correlation with the capacitance.


Capacitance effect on the oscillation and switching characteristics of spin torque oscillators.

Zeng T, Zhou Y, Leung CW, Lai PP, Pong PW - Nanoscale Res Lett (2014)

Jc1, Jc2, and canted region dependence on capacitance. (a)Jc1(Boundary separating oscillation state with canted state) dependence on capacitance. (b)Jc2(Boundary separating canted states and normal complete switching from parallel to anti-parallel) dependence on capacitance. (c) Canted region (Jc2 − Jc1) dependence on capacitance.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4230906&req=5

Figure 4: Jc1, Jc2, and canted region dependence on capacitance. (a)Jc1(Boundary separating oscillation state with canted state) dependence on capacitance. (b)Jc2(Boundary separating canted states and normal complete switching from parallel to anti-parallel) dependence on capacitance. (c) Canted region (Jc2 − Jc1) dependence on capacitance.
Mentions: The capacitance value is varied, and how the canted region evolves is explored in Figure 4. Jc1 is defined as the current boundary separating oscillation state with canted state. As shown in Figure 4a, Jc1 drastically decreases with capacitance in the range of 0.1 to 1 pF and tends to be stable with capacitance greater than 1 pF. Jc2 is defined as the current boundary separating canted state and normal complete switching from parallel to anti-parallel. As shown in Figure 4b, Jc2 increases with capacitance in a quasi-exponential tendency from 0.1 to 1 pF. This tendency is repeated for capacitance in the range of 1 to 10 pF. The difference between Jc2 and Jc1 results in the canted region as shown in Figure 4c. Obviously, the canted region maintains a positive correlation with the capacitance.

Bottom Line: The switching characteristic is featured with the emerging of the canted region; the canted region increases with the capacitance.When the external field is absent, the STO free-layer switching time exhibits different dependences on the capacitance for different injected current.These results help to establish the foundation for capacitance-involved STO modeling.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Electrical and Electronic Engineering, The University of Hong Kong, Pokfulam, Hong Kong.

ABSTRACT
We have studied the capacitance effect on the oscillation characteristics and the switching characteristics of the spin torque oscillators (STOs). We found that when the external field is applied, the STO oscillation frequency exhibits various dependences on the capacitance for injected current ranging from 8 to 20 mA. The switching characteristic is featured with the emerging of the canted region; the canted region increases with the capacitance. When the external field is absent, the STO free-layer switching time exhibits different dependences on the capacitance for different injected current. These results help to establish the foundation for capacitance-involved STO modeling.

No MeSH data available.


Related in: MedlinePlus