Magnetic anisotropies in FeCo fine particles

Remanent magnetization of Fe1–xCox fine particles

“…Since the Fe 0.7 Co 0.3 grains form shorter chains, their high coercivity is mainly originated from induced anisotropy [3]. However, both samples have a bcc crystalline structure [3], and similar values of r S M M . Now, we are in a stage to consider the factors affecting the remanent magnetization, M r .…”

“…The reason is the formation of long chains of grains in these samples. On the contrary, the sample with x = 1 [3] has a relatively low M r whose spherical grains lack the strong interaction.…”

“…Also, a high remanent magnetization introduces the ability of producing strong read signals [1]. The important anisotropies affecting on H c and M r , are shape, magnetocrystalline, induced, and surface anisotropies [3][4][5][6].…”

Time dependence of magnetization in Fe1–xCox fine particles

“…The relation of microstructure, crystalline structure, and coercivity of Fe 1-x Co x samples with different values of x and H 0 has been reported in [8] and [9]. In order to determine the time variation of magnetization, M(t), we first saturated each sample in a magnetic field H s = 5 kOe, then reduced the field in a step manner to a definite value H, and measured the time variation of magnetization in this field via the VSM system.…”

Ultrasonic-assisted surfactant-free synthesis of highly magnetized FeCo alloy nanocrystallite from ferric and cobalt salt

“…in read-write heads of magnetic storage devices, electronic bearings, high-temperature space powder system, and microactuators [8][9][10][11]. Therefore much efforts such as radio frequency plasma torch [12][13][14][15], mechanical alloying [16][17][18][19][20][21], electrodeposition [22][23][24][25][26][27][28][29][30][31], co-sputtering deposition [32][33][34], solvothermal treatment [35], thermal decomposition [36][37][38][39][40], solution phase synthesis [41][42][43][44][45][46][47][48][49][50][51], chemical vapor condensation [52], and sonolysis in organic solvent [53,54] had been devoted to produce FeCo alloys nanostructures. Solution phase synthesis strategies for FeCo nanoparticles have adva...…”