Study of interdomain boundary in diamagnetic domain structure in beryllium

TL;DR

This paper analyzes the diamagnetic domain structure in beryllium single crystals at low temperatures and strong magnetic fields, using a novel muon-based method to quantify interdomain boundaries.

Contribution

It introduces a new technique combining muon histograms and a modified Marquardt minimisation to accurately calculate interdomain boundary characteristics in beryllium.

Findings

Existence of diamagnetic domains confirmed in beryllium

Quantitative boundary volume fractions calculated

Method reduces noise influence in boundary analysis

Abstract

At low temperatures, in strong magnetic fields, the formation of a non-uniform magnetisation is possible in a single-crystal metal sample whose demagnetising factor along the field is close to unity. Namely, so-called Condon diamagnetic domain structure arises and disappears periodically with magnetic field. In this paper, the diamagnetic domain structure in beryllium single crystalis analysed. Directly, existence of diamagnetic domains in that sample was observed earlier by the muon spin precession (mSR) resonance peak splitting. A method is described that allows to calculate quantitative characteristics of the interdomain boundary using the muon histograms. The technique is based on the Marquardt minimisation procedure that has been modified in order to reduce the influence of noise on iterations convergence. Boundary volume fraction was calculated.