Around 7th century B.C. Magnetism recognized in Western Europe/Magnesia region (Fe3O4)
Around 3rd century B.C. Magnetism recognized in China/Magnetite
250 B.C. There is a record of Guiding Army and magnet.
713 A.D. There is a record that Jiseki appeared in Omi Province in Japan.
Around 1200 AD Used for magnetic compasses in Europe
1540 A.D. Gilbert "De Magnete" Book No. 1 of Magnetism
1820-1895 A.D. Many laws relating electric current and magnetism were reported.
Right-handed screw law/Faraday's law of electromagnetic induction
Fleming's Law / Magnetic Recording Concept / Curie's Law
1882 A.D. Invention of silicon steel sheet
1900 AD Announcement of ferrite magnetic material (Bilbert) Spontaneous magnetization
Ferromagnet theory (Weiss)
1912 A.D. Publication of crystal theory of spinel ferrite (Nishikawa)
1917 A.D. Invention of KS steel magnet (Honda) Manufacture of world's first artificial magnet
1930 AD Invention of MK steel magnet (Mishima)/OP magnet and Cu-Zn ferrite (Kato, Takei)/Sendust (Masumoto, Yamamoto)
1940sA.D. Introduction of ferrimagnet (Neel)/Ba ferrite
1950s A.D. Ferrite magnet production started (Philips)/soft ferrite production
1960s AD Development of Sr ferrite/discovery of bubble domain (Bobeck)
1970s A.D. Industrialization of SmCo magnets/Fe-Cr-Co magnets
1980s A.D. NdFeB magnet (Sagawa)/SmFeN (Iriyama et al.)/HDDR
1990s A.D. Nanocomposite magnets
