Magnetic Force Microscopy Investigation of Magnetic Domains in Nd2Fe14B
20 Jul 2010-Vol. 1250, Iss: 1, pp 496-499
TL;DR: In this paper, Nd2Fe14B intermetallic compound with stochiometric composition was prepared from pure elements (Nd ‐99.5%, Fe ¼ 99.95%, B ¼ 98.99%) by arc melting in argon atmosphere.
Abstract: Remenance and coercivity in Nd2Fe14B materials are strongly dependent on the microstructural aspects like phases morphology and grain size. The coercivity (Hc) of a magnetic material varies inversely with the grain size (D) and there is a critical size below which Hc∝D6. Domain wall pinning by grain boundaries and foreign phases is the important mechanism in explaining the improvement in coercivity and remenance. Nd2Fe14B intermetallic compound with stochiometric composition was prepared from pure elements (Nd ‐99.5%, Fe—99.95%, B ‐99.99%) by arc melting in argon atmosphere. Magnetic Force Microscope (MFM) gives high‐resolution magnetic domain structural information of ferromagnetic samples. DI‐3100 Scanning Probe Microscope with MESP probes was used For MFM characterization of the samples. Magnetic domains observed in cast ingots were very long (up to 40 μm were observed) and approximately 1–5 μm wide due to high anisotropy of the compounds. Magnetic domains have displayed different image contrast and mo...
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TL;DR: The magnetic domain structure on the (0 0 1) plane was observed by magneto-optic Kerr effect microscopy in zero magnetic field, with magnetization in four kinds of '1 0 0 magnetic easy directions on the 0 0 1' plane as discussed by the authors.
Abstract: The magnetic domain structure on the (0 0 1) plane of an Fe
16.1
Ga
83.9
single crystal grown by the Czochralski method was observed by magneto-optic Kerr effect microscopy. In zero magnetic field, four different domain phases appeared, with magnetization in four kinds of '1 0 0 magnetic easy directions on the (0 0 1) plane. That is, the magnetic domain structure in zero field was composed of straight 90° domain walls and stair-like 180° domain walls. When a magnetic field was applied in the [0 1 0] direction, primarily 180° domain walls moved, whereas 90° domain walls did not. A striped domain structure composed of 90° domain walls was formed at a field of about 560 Oe, 180° domain walls having almost disappeared. A single domain structure was obtained by applying a field of about 1980 Oe. Magnetostriction in the [0 1 0] direction on the (0 0 1) plane was only about 10 ppm in a field of about 560 Oe and reached a saturation value of about 153 ppm at a field of about 1980 Oe. This magnetostrictive behavior contributes to the evolution of the magnetic domain structure.
19 citations
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TL;DR: The magnetic domain structure on the (0 0 1) plane was observed by magneto-optic Kerr effect microscopy in zero magnetic field, with magnetization in four kinds of '1 0 0 magnetic easy directions on the 0 0 1' plane as discussed by the authors.
Abstract: The magnetic domain structure on the (0 0 1) plane of an Fe
16.1
Ga
83.9
single crystal grown by the Czochralski method was observed by magneto-optic Kerr effect microscopy. In zero magnetic field, four different domain phases appeared, with magnetization in four kinds of '1 0 0 magnetic easy directions on the (0 0 1) plane. That is, the magnetic domain structure in zero field was composed of straight 90° domain walls and stair-like 180° domain walls. When a magnetic field was applied in the [0 1 0] direction, primarily 180° domain walls moved, whereas 90° domain walls did not. A striped domain structure composed of 90° domain walls was formed at a field of about 560 Oe, 180° domain walls having almost disappeared. A single domain structure was obtained by applying a field of about 1980 Oe. Magnetostriction in the [0 1 0] direction on the (0 0 1) plane was only about 10 ppm in a field of about 560 Oe and reached a saturation value of about 153 ppm at a field of about 1980 Oe. This magnetostrictive behavior contributes to the evolution of the magnetic domain structure.
19 citations