Hysterisis material LaSrMnO3

[Rony febiantoro]

dear all to glad to know this forum i am student in university. i am sorry if my english not well

I had running more time for LSMO material (La0,7Sr0,3MnO3) but my refrence show if this material is softmagnet. my refrence from nmag user so i change the parameter

and i have this code in my vampire work

the result is my hysterisis loop is hard magnet? . why its happen ?

[Rony febiantoro]

Vampire cant make softmagnet ? its right ?

[Milton Persson]

If you want it at T = 0 K then you could use sim:program = static-hysteresis-loop instead of sim:program = hysteresis-loop. If it's not at 0 K then you have to do the dynamic simulation and it might look like the material has much higher coersivity than it should simply because the sweep is too fast. One trick is to set critical damping, which you already have (alpha = 1.0), and another thing to do is to just increase the simulation time, i.e. the loop time steps.

I have tried with just Py but the simulation time became too long before I could get reasonable coercivity. There is an article about it where they use "kinetic Monte Carlo" instead of llg: Kinetic Monte Carlo simulations of M-H Loops for HAMR recording media: Comparison with MOKE data, Plumer M., et. al., https://www.researchgate.net/publication/263022496_Kinetic_Monte_Carlo_simulations_of_M-H_Loops_for_HAMR_recording_media_Comparison_with_MOKE_data .

If you find a good solution in Vampire I would appreciate it if you shared it.

[Rony febiantoro]

Thanks buddy i get much from you