Exceptional magnetic shielding via ultra-low-remanence co-based amorphous alloys engineered by atomic ordering
Abstract
Ubiquitous electromagnetic signals enable modern information exchange but also cause radiation, interference, and data security risks. Shielding low-frequency magnetic fields (f < 100 kHz) remains challenging because conventional materials exhibit high residual magnetization that weakens shielding performance. Here, ultra-low residual magnetization in Co-based amorphous alloys is achieved through atomic ordering induced by multi-step rotating magnetic field (MS-RMF) annealing. The alloys show ultra-low coercivity (0.147 A/m), residual magnetic field of ∼50 nT, and a maximum permeability of ∼400,000, resulting in a 70% improvement in magnetic shielding effectiveness by reducing magnetic anisotropy and enhancing domain wall mobility.
Fields of Study & Subjects
Metallic Glasses and Amorphous Alloys
Magnetic properties of thin films
Magnetic Properties of Alloys
Publication details
- Journal / source
- Materials Research Letters
- Publisher
- Informa UK Limited
- Volume
- 14
- Issue
- 7
- Pages
- 792–801
- Publication date
- 20 April 2026
- Language
- EN