LLG's Easy-to-Use Integrated Graphics is One of the Key Features that Distinguishes it from other Simulators of its Kind

Integrated graphics provide the key visual information necessary for assessing the correctness of a problem's solution and for identifying underlying physical processes.  

  • The graphics are integrated into LLG's solver and can be updated in real-time or can be disabled.  
  • LLG allows you to control how you view the data, which is key to their interpretation.
  • With LLG, you can subdivide the viewing window so that you can watch your problem solve in as many modes as you like. 

Graphics Examples

The examples of graphics in this section, listed in the navigation to the left, are all drawn from the two problems specified below, which involve media or a bar magnet.  

Media

The media problem has the following characteristics:

  • Periodic boundary conditions
  • Mean grain size of 100 40nm in diameter
  • Random axis granular anisotropy of 10 and m = 350

The random axis anisotropy gives rise to random axis domains, which are easily understood.

Bar Magnet

The bar magnet problem has the following characteristics:

  • Material = Fe
  • Size = 1000nm x 500nm x 50nm
  • Pixels = 128 x 64 x 8 = 65536 cells
  • Initial condition -> completely random
  • Gamma = 17.6 MHz/Oe
  • Alpha = 1.0
  • Tstep = 1 ps
  • 3D-Complex FFT
  • Rotation Matrices

This problem is seeded with a completely random initial condition. LLG was able to navigate the energy surface and find a high-symmetry low-energy state. The Landau pattern is quasi bulk-like. The film is thick enough to support 3D-like behavior (ie t > 25nm); yet, thin enough that the top and bottom surfaces couple. There are 90-degree domain walls between the domains and two vortices, one up and one down. The corners are quasi vortex-like, in that there is significant canting up/down out of the plane, alternating around the structure. The 180-degree domain walls at the edges are of the Hubert tilted-type. The precision of the calculation is sufficient to resolve the vortex core in bulk and at the surface, as well as the magnetization canting at the corners.