Error! Non-symmetric exchange interactions for materials 1 and 2. Exiting Fatal error: Aborting program. See log file for details.

DibyaR Prakash

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May 31, 2020, 3:14:04 PM5/31/20

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Hi dear all

I got this error

Error! Non-symmetric exchange interactions for materials 1 and 2. Exiting
Fatal error: Aborting program. See log file for details.

What is the problem?

Message has been deleted

Milton Persson

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Jun 8, 2020, 11:39:22 AM6/8/20

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I can only confirm that the exchange constants Jij in the ucf file from your other post are equal to the exchange constant Jji on their "mirrored" line, e.g. "1 0 3 -1 0 0 0.377957730" and "20645 3 0 1 0 0 0.377957730". Have you tried using simpler ucf files before this one?

Milton Persson

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Jun 9, 2020, 4:58:59 AM6/9/20

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In case you are talking about a different simulation and you are not using a ucf file this time, you need to make sure that the exchange matrix in the materials file is symmetric, e.g.

material[1]:exchange-matrix[1] = J1 # exchange constant in material 1

material[1]:exchange-matrix[2] = 2*J1*J2/(J1 + J2) # geometric mean for exchange between materials