Effect of annealing on nanostructure and magnetic properties of Zr2Co11 material

Abstract

Single-phase Zr2Co11 nanomagnetic materials with high coercivity have been fabricated by melt spinning with subsequent annealing under Ar, N2, and vacuum. Annealing coarsens the grains and decreases the density of defects, leading to intergrain decoupling action and the enhancement of the magnetocrystalline anisotropy field of the hard magnetic phase. Therefore, coercivity increases 44.7% from 6.7 kOe for the as-spun to 9.7 kOe for the annealed, which is the highest among Zr-Co alloys so far. The results show that the magnetic-hardening mechanism is primarily dominated by domain-wall pinning. In addition, annealing clearly increases the saturation magnetization. The above results indicate that Zr2Co11 has potential for fabricating rare-earth-free permanent-magnet nanocomposites.

Structures and magnetic properties of Co-Zr-B magnets studied by first-principles calculations

“…Great effort has been devoted to the improvement of their hard magnetic properties. The reported highest coercivity was 9.7 kOe, found in annealed Co 74 Zr 16 Mo 4 Si 3 B 3 ribbons [8] and the optimal magnetic properties were obtained in Co 80 Zr 18 B 2 with intrinsic coercivity Hc=4.1 kOe and energy product (BH) max = 5.1 MGOe [5]. More recently, cluster beam deposition has been used to make Co-Zr/Hf samples and energy products of [16][17][18][19][20] MGOe were reported [9,10].…”

“…), have attracted considerable attentions [1][2][3][4][5][6][7][8][9][10]. Great effort has been devoted to the improvement of their hard magnetic properties.…”

Microstructures and Magnetic Properties of Annealed Zr–Co Alloys

“…Furthermore, the thermal behaviors of these two structures have not been deeply investigated although the cooling rate strongly affected the magnetic properties [8][9][10]. In current, many researches have focused to increase the hard magnetic properties of the Zr2Co11 alloy through adding additional substitutional or interstitial elements for modifying the lattice parameter and changing the alloy composition of as-spun ribbons [11][12][13][14]. However, there is few papers on the annealing behaviors of asquenched ribbons that affect the crystallinity and the grain size of the Zr2Co11 phase.…”

High‐energy‐product MnBi films with controllable anisotropy

“…A basic requirement for these materials to be useful for permanent magnet application is that the materials should show a high energy product (∼20 MGOe) and a high working temperature (∼200 °C) . Recent efforts in permanent‐magnet research have focused on rhombohedral Zr 2 Co 11 and hexagonal MnBi as two potential candidates for rare‐earth‐free permanent magnets . Highly anisotropic Zr 2 Co 11 nanomagnets have been developed using a one‐step cluster‐deposition under the influence of an external magnetic field.…”