Characterization of Magnetic Transformation at Curie Temperature in Finemet-type Microwires by DSC

2012 ◽  
Vol 1408 ◽  
Author(s):  
Sergey Kaloshkin ◽  
Margarita Churyukanova ◽  
Victor Tcherdyntsev
Keyword(s):  
Curie Temperature ◽  
Amorphous Phase ◽  
Amorphous Alloys ◽  
Nanocrystalline Structure ◽  
Soft Magnetic Materials ◽  
Relaxation Processes ◽  
Soft Magnetic ◽  
Dsc Measurements ◽  
Time Dependencies

ABSTRACTFinemet-type amorphous alloys are good soft magnetic materials due to their amorphous-nanocrystalline structure with close to zero magnetostriction. A very sensitive method for controlling relaxation and crystallization processes in such alloys is proposed. It consists in precise DSC measurements of heat capacity peak in the vicinity of the Curie temperature TC. Time-temperature dependencies of TC for microwires in comparison with ribbon shaped amorphous alloys were studied. Relaxation of atomic structure of amorphous phase during annealing was accompanied by an increase of TC. σ-shaped time dependencies are characterized by at least two relaxation processes, corresponding apparent values of activation energy were estimated. Decomposition of amorphous phase and redistribution of components between amorphous phase and growing nanocrystals affect the shape and position of the DSC peak at TC as well.Study of microwires with glass coating revealed the influence of internal stress on the shape and position of the Curie peak on DSC curve: increase of internal strain tensions leads to suppression of the TC peak.

Structural Studies of the Relaxed Amorphous Phase in the Fe81B14Nb5 Alloy

2013 ◽  
Vol 203-204 ◽  
pp. 380-385 ◽  
Author(s):  
Małgorzata Karolus
Keyword(s):  
Magnetic Properties ◽  
Amorphous Phase ◽  
Magnetic Permeability ◽  
Amorphous Alloys ◽  
Melt Spinning ◽  
Soft Magnetic Materials ◽  
Soft Magnetic Properties ◽  
Structural Studies ◽  
Soft Magnetic ◽  
Melt Spinning Technique

Amorphous alloys based on iron, obtained by melt spinning technique, are modern and very promising soft magnetic materials. The thermal annealing at temperatures closed to the crystallization temperature can cause an increase of magnetic permeability more than 10 times i.e. the so called enhancement of soft magnetic properties effect (ESMP). It is usually explained by formation of iron nanocrystallites in amorphous surroundings or by formation of the relaxed amorphous phase. Such a microstructure leads to averaging out of magnetic anisotropy and cause the ESMP.

A Practical Method for the Characterization of Soft-Magnetic Materials

2015 ◽  
Vol 51 (11) ◽  
pp. 1-4 ◽  
Author(s):  
Luiz A. Righi ◽  
Paulo R. Eckert ◽  
Aly F. Flores Filho
Keyword(s):  
Magnetic Materials ◽  
Practical Method ◽  
Soft Magnetic Materials ◽  
Soft Magnetic

scholarly journals Vector characterization of soft magnetic materials

2005 ◽  
Vol 97 (10) ◽  
pp. 10R306 ◽  
Author(s):  
Z. W. Lin ◽  
H. W. Lu ◽  
J. G. Zhu ◽  
J. J. Zhong ◽  
X. L. Wang ◽  
...  
Keyword(s):  
Magnetic Materials ◽  
Soft Magnetic Materials ◽  
Soft Magnetic

Preparation and characterization of Fe–Nb–Cu–Si–B-based nanocrystalline soft magnetic materials

2001 ◽  
Vol 182 (3-4) ◽  
pp. 321-325 ◽  
Author(s):  
A Mitra ◽  
A.K Panda ◽  
V Rao ◽  
S.R Singh ◽  
P Ramachandrarao
Keyword(s):  
Magnetic Materials ◽  
Soft Magnetic Materials ◽  
Soft Magnetic

scholarly journals Giant Stress Impedance Magnetoelastic Sensors Employing Soft Magnetic Amorphous Ribbons

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2175 ◽  
Author(s):  
Juan Jesús Beato-López ◽  
Juan Garikoitz Urdániz-Villanueva ◽  
José Ignacio Pérez-Landazábal ◽  
Cristina Gómez-Polo
Keyword(s):  
Amorphous Alloys ◽  
Subsequent Development ◽  
Young Modulus ◽  
Amorphous Structure ◽  
Rapid Quenching ◽  
Soft Magnetic ◽  
Highly Sensitive ◽  
Magnetoelastic Sensors ◽  
Soft Magnetic Amorphous Alloys

Soft magnetic amorphous alloys obtained via rapid quenching techniques are widely employed in different technological fields such as magnetic field detection, bio labeling, non-contact positioning, etc. Among them, magnetoelastic applications stand out due to excellent mechanical properties exhibited by these alloys, resulting from their amorphous structure, namely, their high Young modulus and high tensile strength. In particular, the giant stress impedance (GSI) effect represents a powerful tool to develop highly sensitive magnetoelastic sensors. This effect is based on the changes in the high-frequency electric impedance as the result of the variation in magnetic permeability of the sample under the action of mechanical stresses. In this work, the GSI effect is analyzed in two soft magnetic ribbons ((Co0.93 Fe0.07)75 Si12.5 B12.5 and (Co0.95 Fe0.05)75 Si12.5 B12.5) for the subsequent development of two practical devices: (i) the characterization of the variations in the cross-section dimensions of irregularly shaped elements, and (ii) the design of a flow meter for measuring the rate of flow of water through a pipe.

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