Fe(Co)SiBPCCu nanocrystalline alloys with high B s above 1.83 T

Exceptionally High Saturation Magnetic Flux Density and Ultralow Coercivity via an Amorphous–Nanocrystalline Transitional Microstructure in an FeCo‐Based Alloy

“…To highlight the exceptional high B s of (Fe 0.8 Co 0.2 ) 85 ANT alloy, we collected the existing data of Fe‐based nanocrystalline alloys (FINEMET‐type, NANOPERM‐type, HITPERM‐type, Fe‐(BSiPC)‐Cu‐type, Fe‐(BSiPC)‐type) and typical silicon steels previously reported, [ 9,11,19,27–31,40–56 ] and present these data with the mass fraction of ferromagnetic elements ( Figure a). Normally, increasing ferromagnetic element content results in higher B s and inferior GFA.…”

A Review of Fe‐Based Amorphous and Nanocrystalline Alloys: Preparations, Applications, and Effects of Alloying Elements

“…[ 35 ] Liu found that the substitution of Co for Fe increased the B s of Fe 84.75− x Co x Si 2 B 9 P 3 C 0.5 Cu 0.75 ( x = 0, 2.5, 10 at%) alloys. [ 41 ] Under the optimum annealing conditions, the B s of the nanocrystalline alloy without Co was 1.83 T, and that of Fe 74.75 Co 10 Si 2 B 9 P 3 C 0.5 Cu 0.75 alloy with Co increased to 1.87 T. Porsons prepared a series of (Fe 1− x Co x ) 87 B 13 ( x = 0–0.5 at%) amorphous and nanocrystalline alloy substituting Fe with Co elements and found that the nanocrystalline alloy B s = 1.86 T without the addition of Co and a maximum B s = 2.04 T was observed at x = 0.25 at%. [ 42 ] The H c of the alloy increased with the Co content, with H c = 6.4 A m −1 at x = 0 at% and H c = 10.2 A m −1 at x = 0.25 at%.…”

“…The crystallization behavior of Fe‐based amorphous and nanocrystalline alloys was fundamentally changed by Cu. [ 41 ] The α‐Fe grains precipitated from the alloy without adding Cu are coarse and uneven after annealing. After adding Cu to the alloy, Cu first precipitates from the amorphous matrix to form Cu clusters, which provide nucleation sites for α‐Fe and make the microstructure more uniform.…”

Ultrahigh Permeability at High Frequencies via A Magnetic‐Heterogeneous Nanocrystallization Mechanism in an Iron‐Based Amorphous Alloy

“…The reported data on magnetic permeability of soft magnetic materials at high frequencies are mainly concentrated around 100 kHz. The μ e and B s values of FCMS, other typical amorphous/nanocrystalline alloys [10,12,13] and previously reported soft magnetic materials [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45] are summarized and compared at 100 kHz (Figure 4a). It can be seen that the optimal μ e and B s of FCMS core reach 36 000@100 kHz and 1.42 T, respectively, realizing a combination of the highest μ e and relatively higher B s among all soft magnetic materials.…”