The residual amorphous phase in nanocrystalline soft magnetic FeSiCuNbB

1996 ◽  
Vol 32 (5) ◽  
pp. 4881-4883 ◽  
Author(s):  
C. Kuhrt ◽  
G. Herzer
Keyword(s):  
Amorphous Phase ◽  
Soft Magnetic ◽  
Residual Amorphous Phase

Anomalous magnetic properties of the nano-size residual amorphous phase in nanocrystals

1999 ◽  
Vol 11 (17) ◽  
pp. L179-L185 ◽  
Author(s):  
D Kaptás ◽  
T Kemény ◽  
J Balogh ◽  
L Bujdosó ◽  
L F Kiss ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Amorphous Phase ◽  
Residual Amorphous Phase ◽  
Nano Size

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.

Studies of nanocrystalline phase and residual amorphous phase of FeCuNbSiB alloy

1999 ◽  
Vol 8 (6) ◽  
pp. 455-462 ◽  
Author(s):  
Lin De-ming ◽  
Wang Hua-sheng ◽  
Wu Yi-chu ◽  
Lin Mu-liang
Keyword(s):  
Amorphous Phase ◽  
Nanocrystalline Phase ◽  
Residual Amorphous Phase

Creep of FINEMET Alloy at Amorphous to Nanocrystalline Transition

2009 ◽  
Vol 409 ◽  
pp. 373-376
Author(s):  
Kornel Csach ◽  
Jozef Miškuf ◽  
Alena Juríková ◽  
Václav Ocelík
Keyword(s):  
Mechanical Properties ◽  
Magnetic Properties ◽  
Amorphous Phase ◽  
High Temperatures ◽  
Structural Relaxation ◽  
Amorphous Alloys ◽  
Creep Properties ◽  
Residual Amorphous Phase ◽  
Creep Measurements

The application of FINEMET-type materials with specific magnetic properties prepared by the crystallization of amorphous alloys is often limited by their brittleness. The structure of these materials consists of nanosized Fe-based grains surrounded with amorphous phase. Then the final macroscopic mechanical properties are considerably influenced by the properties of this amorphous phase. Direct creep measurements during the crystallization of FINEMET alloys were performed and the creep properties of the residual amorphous phase formed during the nanocrystallization were described. It was shown that due to relatively high temperatures the residual amorphous phase undergoes intensive structural relaxation resulting in the obvious embrittlement of these materials.

Nanocrystalline Soft Magnetic Fe-M-B (M = Zr, Hf, Nb) “NANOPERM,” Fe-M-O (M = Zr, Hf, Rare Earth) Alloys and Their Applications

1999 ◽  
Vol 577 ◽  
Author(s):  
A. Makino ◽  
A. Inoue ◽  
T. Masumoto
Keyword(s):  
Rare Earth ◽  
Amorphous Phase ◽  
High Frequency ◽  
Core Loss ◽  
Dominant Factor ◽  
Switching Converters ◽  
High Permeability ◽  
Soft Magnetic ◽  
Electric Equipment ◽  
Partial Crystallization

ABSTRACTNew soft magnetic nanocrystalline materials in Fe-M-B (M = Zr, Hf, Nb) and Fe-M-O (M = Zr, Hf, rare earth) systems have been fabricated by use of partial crystallization of melt-spun amorphous phase and sputtering-induced partial crystallization, respectively. These alloys have a mixed structure of nanoscale a-Fe grains and an amorphous phase containing large amount of M, B and M, O, respectively. This structural property should be a dominant factor for achieving good soft magnetic properties in both alloys. The Fe85.5Zr2Nb4B8.5 ribbon exhibits a high mag- netic flux density (Bs) of 1.64 T and a high permeability of 60,000 at 1 kHz as well as a very low core loss of 0.09 W/kg at B = 1.4 T and 50 Hz. The soft magnetic Fe-M-O films with high O content of 10-35 at.% maintain high permeability up to the high frequency above 100 MHz be- cause of higher electrical resistively of 6 to 23 µΩm than those of other conventional soft mag- netic alloy films. The Fe-M-B ribbons "NANOPERM" should be more suitable for low frequen- cy transformers. The Fe-M-O films are useful for high frequency applications such as thin-film inductors and transformers for micro switching converters for portable electric equipment.

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