TY - JOUR
T1 - Magnetization amplified by structural disorder within nanometre-scale interface region
AU - Murakami, Y.
AU - Niitsu, K.
AU - Tanigaki, T.
AU - Kainuma, R.
AU - Park, H. S.
AU - Shindo, D.
N1 - Funding Information:
We are grateful to Dr T. Matsuda, Mr S. Aizawa, Dr E. Okunishi and Mr A. Yasuhara for their collaboration and useful discussions. This research was supported by a grant from the Japan Society for the Promotion of Science (JSPS) through the ‘Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST Program)’ initiated by the Council for Science and Technology Policy (CSTP) and a Grant-in-Aid for Scientific Research from JSPS.
PY - 2014/6/18
Y1 - 2014/6/18
N2 - Direct magnetization measurements from narrow, complex-shaped antiphase boundaries (APBs; that is, planar defect produced in any ordered crystals) are vitally important for advances in materials science and engineering. However, in-depth examination of APBs has been hampered by the lack of experimental tools. Here, based on electron microscopy observations, we report the unusual relationship between APBs and ferromagnetic spin order in Fe 70 Al 30. Thermally induced APBs show a finite width (2-3â ‰nm), within which significant atomic disordering occurs. Electron holography studies revealed an unexpectedly large magnetic flux density at the APBs, amplified by approximately 60% (at 293â ‰K) compared with the matrix value. At elevated temperatures, the specimens showed a peculiar spin texture wherein the ferromagnetic phase was confined within the APB region. These observations demonstrate ferromagnetism stabilized by structural disorder within APBs, which is in direct contrast to the traditional understanding. The results accordingly provide rich conceptual insights for engineering APB-induced phenomena.
AB - Direct magnetization measurements from narrow, complex-shaped antiphase boundaries (APBs; that is, planar defect produced in any ordered crystals) are vitally important for advances in materials science and engineering. However, in-depth examination of APBs has been hampered by the lack of experimental tools. Here, based on electron microscopy observations, we report the unusual relationship between APBs and ferromagnetic spin order in Fe 70 Al 30. Thermally induced APBs show a finite width (2-3â ‰nm), within which significant atomic disordering occurs. Electron holography studies revealed an unexpectedly large magnetic flux density at the APBs, amplified by approximately 60% (at 293â ‰K) compared with the matrix value. At elevated temperatures, the specimens showed a peculiar spin texture wherein the ferromagnetic phase was confined within the APB region. These observations demonstrate ferromagnetism stabilized by structural disorder within APBs, which is in direct contrast to the traditional understanding. The results accordingly provide rich conceptual insights for engineering APB-induced phenomena.
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U2 - 10.1038/ncomms5133
DO - 10.1038/ncomms5133
M3 - Article
AN - SCOPUS:84902791240
SN - 2041-1723
VL - 5
JO - Nature Communications
JF - Nature Communications
M1 - 4133
ER -