The idea of the paper is to study the structure and approach to magnetic saturation in the Fe₃₆Co₃₆B₁₉Si₅Nb₄ bulk amorphous alloy in the shape rods with diameter of 1 and 2 mm. Investigated material were produced by the pressure die casting method. The ingot alloy was prepared by repeatedly inductive melting under a protective argon atmosphere using high purity elements. Subsequently, liquid melt was push out from quartz capillary to suitable rod forming copper die with using inert gas. The structure of obtained samples in solidified state was examined by X-ray diffraction (XRD) method and Mössbauer spectrometry.

From these studies we have stated that samples are fully amorphous. The regions with low and high density in the bulk amorphous alloys occur and due to magnetoelastic coupling influence the magnetization behavior in the vicinity of the ferromagnetic saturation. Any departure from the atoms system in liquid state be in thermodynamic equilibrium can be considered a defect in amorphous material [1].

Defects occurs in studied bulk ferromagnetic amorphous materials presenting source of short range stresses were investigated by indirectly method. These method was based on measurement of magnetization in high magnetic fields [2-4] by a vibrating sample magnetometer (VSM). In accordance to [1-4] magnetic polarization in high magnetic fields can be described by the equation:

m₀M(H)=m₀M_S[1-Σ_i (a_i)/(μ₀H)ⁱ]+b(μ₀H)^1/2,

where:

m₀M_S- magnetic saturation polarization

μ₀- magnetic permeability of free space,

H – magnetic intensity,

M_S – magnetization intensity,

a, b – coefficents.

On the basis of results obtained by VSM method in high magnetic field it was observed that the diameter of rods (of the amorphous materials) has significant influence on size of defects. For all diameters of the analyzed alloy, important role in magnetization process in the vicinity of the ferromagnetic saturation plays sets of conglomeration of point-like defects, referred as quasi-dislocation dipoles.    For magnetic field above 1T, where the relation (μ₀H)^1/2 is valid for every diameter of the rod made of Fe₃₆Co₃₆B₁₉Si₅Nb₄ alloy, the Holstein – Primakoff paraprocess connected with damping of thermal activation spine wave [5] is observed.

1. N. Lange, H. Kronmüller “Low temperature magnetization of sputtered amorphous Fe – Ni – B films” Phys. Stat. Sol (A) 95, 2 (1986) 621-633.
2. O. Kohmoto “High – field magnetization curves of amorphous alloys” Journal of Appl. Phys. 53, 11 (1982) 7486-7490.
3. H. Kronmüller, M. Fähnle “Micromagnetism and the microstructure of ferromagnetic solids” Cambridge University Press (2003).
4. M. Vazquez, W. Fernengel, H. Kronmüller “Approach to magnetic saturation in rapidly quenched amorphous alloys” Phys. Stat. Sol. (A) 115, 2 (1989) 547-553.
5. T. Holstein, H. Primakoff “Field dependence of the intrinsic domain magnetization of a ferromagnet” Phys. Rev. 58 (1940) 1098 – 1113.

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/19102 must be provided.

1. Study of the microstructure and magnetic properties of Fe₆₀Co₅Zr₁₀Mo₅B₂₀ bulk amorphous and partially crystallized soft magnetic alloy.
2. Study of the mechanical and magnetic properties of Fe₆₁Co₁₀Zr_5-xHf_xW₂Y₂B₂₀ (x = 0, 3) bulk amorphous and crystalline alloys 
3. Microstructure, thermal stability and magnetic properties of bulk amorphous Fe_73-xCo_xNb₅Y₃B₁₉ (x = 0 or 10)
4. Structural and magnetic properties of multilayer system ferromagnetic/metallic separator/ferromagnetic
5. Thermal stability and soft magnetic properties of  Fe₆₁Co₁₀Zr_2,5Hf_2,5Me_4-xW₂B₂₀ (Me = Nb, Mo, Ti, Y, Ni) bulk amorphous alloys obtained by induction suction method.
6. Corrosion behaviour of amorphous and crystalline Fe₅₉Co₁₀Zr₂Y₄Nb₅Ni₅B₁₅ alloy in acidified sulphate and phosphate environments
7. Phase decomposition and some magnetic properties in bulk amorphous multicomponent Fe‑based alloys