Feature #2417

Polarized: support z-component of magnetic field

Added by dmitry 10 months ago. Updated 9 days ago.

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

0%

Category:-
Target version:-

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 - summary of tasks In Progress

History

#1 Updated by dmitry 10 months ago

  • Status changed from New to Backlog

#2 Updated by dmitry 10 months ago

#3 Updated by rbeerwerth 3 months 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.

#4 Updated by wuttke 9 days ago

  • Subject changed from Handling z-component of magnetic field to Core: polarized: support z-component of magnetic field

#5 Updated by wuttke 9 days ago

  • Subject changed from Core: polarized: support z-component of magnetic field to Polarized: support z-component of magnetic field

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