Method for applying current pulses

[Wanlu Yu]

Hello,  

I would like to inquire about how to set up the generation of skyrmions by applying pulsed current. The specific requirements are as follows:  

1. Vertically inject current into a central region with a diameter of 35 nm.  
2. The spin-polarized current should have a polarization direction of -z, with a pulse width of 2 ns and a current density of 2 × 10^8 A/cm².  
3. Apply a 2 ns spin-polarized current pulse in the central region, with the polarization direction set to -z.  

Thank you very much for your help!  

Sincerely,  
[Wanlu]

[Yuki Liu]

J := (     )

run (2e-9)

J := ( 0, 0,0 )

[Wanlu Yu]

Dear Liu

I am attempting to generate magnetic skyrmions by applying a pulsed current in Region 6, following the methodology described in a reference paper. According to the literature, after relaxing the initial magnetic state, a 2-ns spin-polarized current pulse is applied via vertical injection, with the spin polarization oriented along the -z direction. The skyrmion nucleation is expected to be triggered by spin-transfer torque (STT) inducing magnetization reversal.

However, I am encountering an issue with my simulation code. After running the relaxation step, no skyrmion is generated. I suspect there might be an error in my implementation, but I am unable to identify it.

I would greatly appreciate it if you could review my code and provide guidance on what might be going wrong. Thank you very much for your assistance.

Best regards,  
[Wanlu]