Feature #2417

Handling z-component of magnetic field

Added by dmitry 8 months ago. Updated 13 days ago.

Status:BacklogStart date:20 Nov 2019
Priority:NormalDue date:
Assignee:-% Done:

0%

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Description

As described in section 1.1 of this internal report,
external magnetic field is subtracted during the computation of the wave reflected from magnetized sample.
In the section 1.2 of the same document it is stated, that z-component of the magnetic field (that is, the one normal to the sample surface)
must be constant across the sample.

As the result, z-component of magnetic field, B_z, is always nullified during the computation.
It would be useful to check how it is treated in other codes.
For example, GenX considers only the angle between beam polarization and the direction of the magnetic field, thus avoiding direct treatment of z-component.
This approach however does not allow for not fully polarized beams and imperfect analyzers.

Anyhow, B_z nullifying has a counter-intuitive behavior, since a user can specify any B_z in the layers,
but it will not affect the result of computation.


Related issues

Related to BornAgain - Envelope task #2419: Polarized reflectivity In Progress 03 Jun 2020

History

#1 Updated by dmitry 8 months ago

  • Status changed from New to Backlog

#2 Updated by dmitry 8 months ago

#3 Updated by rbeerwerth 13 days ago

The z-component is mostly irrelevant for reflectometry, according to Artur.
For this reasons we should in first instance consider to restrict the magnetization to be in-plane, this pretty much spares us from this issue for the moment.
I will also discuss this issue with J├╝lich sometimes, but would not put it very high on the agenda yet.

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