Effect of Iron on the Enhancement of Magnetic Properties for Cobalt-Based Soft Magnetic Metallic Glasses

Abstract

Thermal and magnetic properties of a recently developed metallic glass of four different compositions [{Co (1Àx) Fe (x) } (0.75) B (0.2) Si (0.05) ] 96 Cr 4 were evaluated, where x = 0, 0.1, 0.2, and 0.3. Coercivity decreased and saturation magnetization increased with the increase in iron content. All alloys showed a high Curie temperature. The trend in thermal stability and magnetic properties was explained by atomic interactions between the constituent elements and s-d hybridization between the ferromagnetic metal and the metalloid atoms.Low hysteresis losses, high saturation magnetization, and low coercivity make Co-Fe based soft magnetic alloys attractive for a number of applications including transformers, motors, sensors, magnetometers, and data recording. [1,2] Magnetic properties of several Co-Fe based nanocrystalline alloys have been investigated for low-loss applications. [3] However, nanocrystalline alloys have grain boundaries, crystalline defects, and different crystal orientations, which limit their use in magnetic applications. In contrast, metallic glasses are free of grain boundaries and have a homogeneous structure, which are potential advantages for developing low-loss soft magnetic materials with controlled properties. High glass transition temperature (T g ) and high Curie point of Co-Fe based metallic glasses are added advantages for high temperature soft magnetic applications. The high Curie point of Co-Fe alloys stems from the strong exchange interaction of magnetic spin between Co and Fe atoms. [4] Therefore, optimum addition of Fe to Cobased metallic glasses may result in enhancement of magnetic properties as well as glass forming ability (GFA).High permeability, [5] excellent mechanical properties, low magnetostriction, and low coercivity are some desirable properties reported for Co-Fe metallic glasses. [6][7][8] The saturation magnetization value for Co-Fe-Ta-B system has been reported to be around 0.5 T with 0.25-0.9 A/m coercivity. Along with good thermal stability, this alloy system exhibits excellent mechanical properties, such as high fracture strength of 5185 MPa. [7,9] Inoue et al. reported the magnetic properties of Co-Fe-Si-B-Nb system with saturation magnetization around 0.60 T and coercivity of 1.55 A/m. [10] Recently, the effect of Cu and Tb (non-magnetic elements) addition on the glass formability and magnetic properties of iron-based metallic glasses has been studied. Addition of Cu and Tb resulted in lowering of glass formability and enhancement of soft magnetic properties. [11,12] However, the change in magnetic properties by systematically changing the iron content in Co-based soft magnetic metallic glasses has not been investigated till date. Furthermore, there are no reports on the magnetization behavior at high temperatures for Co-Fe metallic glasses. Systematic investigation of GFA and magnetic properties for Co-Fe metallic glasses can lead to valuable scientific insight and novel engineering applications.In the present work, the effect of iron content on the gl...

Magnetically recoverable carbon-coated iron carbide with arsenic adsorptive removal properties

“…Even after normalizing to only the Fe 3 O 4 content (77.1 emu/g-Fe 3 O 4 and 68.9 emu/g-Fe 3 O 4 ), the magnetic saturation was lower after coating, which is possibly due to surface spin disorder caused by the silica shell and the interactions between the non-magnetic SiO 2 atoms and the magnetic c-Fe 3 O 4 atoms [65,69,70]. In addition, the c-Fe 3 O 4 @SiO 2 had greater magnetic remanence and coercivity values than c-Fe 3 O 4 , due to the presence of its SiO 2 shell [71].…”

Machine learning prediction of magnetic properties of Fe-based metallic glasses considering glass forming ability

“…These theories or models that consider insufficient factors usually have many exceptions, and their estimation accuracy is limited. Therefore, it is still a challenge to reveal an accurate variation pattern of the soft magnetic properties of FeMGs based on physiochemical theories, so a large number of experiments consider a trial-and-error strategy to develop high-performance metallic glasses 4 [17][18][19][20][21][22][23][24][25][26].…”

Структура и магнитные свойства аморфных и нанокристаллических сплавов Co-Fe-B-(Nb, Ti)

“…Введение легирующих компонентов может по-разному влиять на магнитные свойства [23][24][25]. Например, добавление Fe в аморфные сплавы на основе кобальта способствует увеличению намагниченности насыщения и уменьшению коэрцитивной силы [26], при добавлении Pt в аморфные сплавы системы Co-Si-B наблюдается уменьшение намагниченности насыщения [27].…”