Wydział Chemii

Piotr Józef Bardziński

Dagmara Kulesza

Paul D. Asimow

Jinping Hu

Stephen Armstrong

Daniel M. Silevitch

T. F. Rosenbaum

Jerzy P. Goraus

Kyle Hunady

B. Fultz

2026

Acta Materialia

311

122177/1-122177/18

10.1016/j.actamat.2026.122177

Naukowa

Angielski

Artykuł

We report the effects of shock compression and release on the structural and magnetic properties of icosahedral Al–Cu–Fe quasicrystals grown via a self-flux method. A 3 kJ projectile impact modulates the quasicrystalline structure by introducing phason strain without inducing a phase transition, at pressures of 13.4 GPa (first shock) and 21.6 GPa (reflected shock). Magnetic moments and negative Curie–Weiss temperatures of this quasicrystal indicate dilute antiferromagnetic ordering. Shock compression enhanced the  = 10 K saturation magnetization, saturation field, and coercive field, suggesting reduced constraint of ideal icosahedral lattice geometry after shock compression. Both pre- and post-shock samples align the easy magnetization direction along the 5-fold axis at high fields, but the shock-compressed sample briefly shifts to a 2-fold axis at 8 T before returning to 5-fold at 9 T. A Fourier expansion retaining harmonics  = 1–6 is needed to correctly describe the angular dependence of the magnetic torque in the broad field range 20 mT–9 T. The emergence of the odd Fourier terms is a unique property of quasicrystalline magnetic anisotropy. The magnitudes of the even terms increased two-fold following shock compression.

Quasicrystal, Magnetism, Shock compression, Anisotropy, Atomic structure

http://dx.doi.org/10.1016/j.actamat.2026.122177

http://www.elsevier.com