naa a22 4500 510770517 CHVBK 20180411083211.0 cr unu---uuuuu 180411e20130701xx s 000 0 eng 10.1007/s11837-013-0618-z doi (NATIONALLICENCE)springer-10.1007/s11837-013-0618-z Advances in Characterization of Non-Rare-Earth Permanent Magnets: Exploring Commercial Alnico Grades 5-7 and 9 [Elektronische Daten] [A. Palasyuk, E. Blomberg, R. Prozorov, L. Yue, M. Kramer, R. Mccallum, I. Anderson, S. Constantinides] The magnetic domain structure of commercial alnico grades 5-7 and 9 was investigated using a magneto-optical Kerr effect (MOKE) to gain an understanding of their coercivity mechanisms at the micron to millimeter scale. In alnico 5-7, the magnetic domain structure exhibits stripes of alternating high and low induction. Magnetic domains easily cross grain boundaries if neighboring grains have a similar tilt and rotation of their crystallographic axes relative to the magnet body. In contrast for alnico 9, stripe-like magnetic domains are not observed regularly throughout the transverse section; rather, discrete localization of high- and low-induction stripe features are observed. In higher magnification MOKE experiments, i.e., ~100μm, a zigzag-shaped magnetic domain structure was observed in both alnico 5-7 and 9. The zigzag features are four to five times smaller in size than an average grain of alnico 5-7, implying a pinning mechanism that is caused by structural elements within the grains. Discontinuous and reversible motion on a length scale of a few microns was observed for the zigzag-shaped domains for incremental changes in the applied field of ~10 Oe. Complimentary magnetic force microscopy measurements show that there are domain structures on an even smaller scale, i.e., 2μm to 100μm. TMS (outside the USA), 2013 Palasyuk A. Department of Material Science and Engineering, Iowa State University, 50011, Ames, IA, USA aut Blomberg E. Department of Physics and Astronomy, Iowa State University, 50011, Ames, IA, USA aut Prozorov R. Ames Laboratory, U.S. Department of Energy, Iowa State University, ISU Campus, 50011, Ames, IA, USA aut Yue L. Nebraska Center for Materials and Nanoscience, University of Nebraska, 68508, Lincoln, NE, USA aut Kramer M. Department of Material Science and Engineering, Iowa State University, 50011, Ames, IA, USA aut Mccallum R. Department of Material Science and Engineering, Iowa State University, 50011, Ames, IA, USA aut Anderson I. Department of Material Science and Engineering, Iowa State University, 50011, Ames, IA, USA aut Constantinides S. Arnold Magnetic Technologies Corporation, 14625, Rochester, NY, USA aut JOM Springer US; http://www.springer-ny.com 65/7(2013-07-01), 862-869 1047-4838 65:7<862 2013 65 11837 https://doi.org/10.1007/s11837-013-0618-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11837-013-0618-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Palasyuk A. Department of Material Science and Engineering, Iowa State University, 50011, Ames, IA, USA aut NATIONALLICENCE 700 1- Blomberg E. Department of Physics and Astronomy, Iowa State University, 50011, Ames, IA, USA aut NATIONALLICENCE 700 1- Prozorov R. Ames Laboratory, U.S. Department of Energy, Iowa State University, ISU Campus, 50011, Ames, IA, USA aut NATIONALLICENCE 700 1- Yue L. Nebraska Center for Materials and Nanoscience, University of Nebraska, 68508, Lincoln, NE, USA aut NATIONALLICENCE 700 1- Kramer M. Department of Material Science and Engineering, Iowa State University, 50011, Ames, IA, USA aut NATIONALLICENCE 700 1- Mccallum R. Department of Material Science and Engineering, Iowa State University, 50011, Ames, IA, USA aut NATIONALLICENCE 700 1- Anderson I. Department of Material Science and Engineering, Iowa State University, 50011, Ames, IA, USA aut NATIONALLICENCE 700 1- Constantinides S. Arnold Magnetic Technologies Corporation, 14625, Rochester, NY, USA aut NATIONALLICENCE 773 0- JOM Springer US; http://www.springer-ny.com 65/7(2013-07-01), 862-869 1047-4838 65:7<862 2013 65 11837 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer