In-situ Lorentz microscopy of Fe85Si2B8P4Cu1 nanocrystalline soft magnetic alloys

• Published in: Journal of magnetism and magnetic materials Vol. 375; pp. 10 - 14
• Main Authors: Akase, Zentaro, Aizawa, Shinji, Shindo, Daisuke, Sharma, Parmanand, Makino, Akihiro
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.02.2015
• Subjects: Lorentz microscopy; Magnetic domain-wall motion; Nanocrystalline soft magnetic alloy; Nanocrystalline soft magnetic alloy; Magnetic domain-wall motion; Lorentz microscopy
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2014.08.101

Microstructure dependence of magnetic properties of soft magnetic Fe–Si–B–P–Cu nanocrystalline alloys were studied by using in-situ Lorentz microscopy in a transmission electron microscope equipped with a magnetizing system. In particular, we investigated in detail motion of magnetic domain walls in heat-treated Fe85Si12B6P4Cu1 amorphous ribbons. Smooth motion of domain walls was observed for the optimally heat-treated (at 430°C) nano-crystalline alloy. Pinning of domain walls was observed for higher-temperature-heat-treated (470°C) ribbons. Both ribbons showed a nanocrystalline structure containing α-Fe crystallites of about 15nm in size. Electron diffraction patterns indicated that the higher-temperature-heat-treated samples contained boride precipitates, which is considered to cause less smooth domain wall motion. •Magnetic properties of newly developed Fe–Si–B–P–Cu nanocrystalline alloys are analyzed by TEM.•Motion of magnetic domain walls were visualized by in-situ Lorentz microscopy.•Borides (Fe2B) in heat-treated specimen cause reduction in domain wall motion smoothness.