Magnet

Magnetization

Magnetic anisotropy

Stoner–Wohlfarth model

Micromagnetics

Optics

Quantum mechanics

Remanence

Condensed matter physics

Magnetic field

Coercivity

Isotropy

Magnetization reversal

Materials science

Physics

Ferromagnetism

Advanced Materials

High‐performance ferromagnetic materials are essential for energy conversion and electronic devices. However, the random and nonuniform magnetization reversal in ferromagnetics limits their performance that can be achieved. Here, through both micromagnetism simulations and experiments, a directional magnetization reversal that initiates first from large grains toward smaller ones is discovered by engineering Nd 2 Fe 14 B/α‐Fe gradient nanostructures. Such directional magnetization reversal enables a rare combination of high magnetization and large coercivity, thus leading to a record‐high energy density (26 MG Oe) for isotropic permanent magnetic materials, which is ≈50% higher than that of its gradient‐free counterpart. The unusual magnetization reversal originates from an ordered arrangement of grain sizes in the gradient material, where the large grains have a lower reversal field than that of the smaller ones. These findings open up new opportunities for developing high‐performance magnetic materials.

Directional Magnetization Reversal Enables Ultrahigh Energy Density in Gradient Nanostructures