# MLZ Conference: Neutrons for information and quantum technologies

4-7 June 2019
Arabella Brauneck Hotel
Europe/Berlin timezone
Abstract submission and registration open until Wednesday, 29th May.

## Magnetic Guinier Law

6 Jun 2019, 17:30
1h 30m
Arabella Brauneck Hotel

#### Arabella Brauneck Hotel

Münchner Str. 25 83661 Lenggries
Poster

### Speaker

Artem Malyeyev (University of Luxembourg)

### Description

The so-called Guinier law represents the low-$q$ approximation for the small-angle scattering curve
from a dilute assembly of identical and randomly oriented particles. This relation has been derived
for nonmagnetic particle-matrix-type systems; an important prerequisite for it to apply is the
presence of a sharp interface separating particles and matrix. On the other hand, it is well
known that the magnetic microstructure of nanocrystalline magnets is highly nonuniform on the
nanometer length scale and characterized by a spectrum of continuously varying long-wavelength
magnetization fluctuations. This results in a large and strongly field-dependent magnetic small angle neutron scattering (SANS) cross section. In this work we introduce the Guinier law for
the case of magnetic SANS and provide an analysis of experimental data on a hard magnetic
Nd-Fe-B-based and a soft magnetic Fe-based nanocomposite.

### Primary authors

Andreas Michels (University of Luxembourg) Artem Malyeyev (University of Luxembourg)

### Presentation Materials

There are no materials yet.