Magnetic Domain Structure of NiFe and MnIr/NiFe Elements Patterned by Focused Ion Beam.

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  • Kato Takeshi
    Department of Electronics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
  • Suzuki Keigo
    Department of Electronics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
  • Tsunashima Shigeru
    Department of Electronics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
  • Iwata Satoshi
    Center for Cooperative Research in Advanced Science & Technology, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan

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Square shaped NiFe (5-30 nm) and MnIr (20 nm)/NiFe (15 and 20 nm) elements were fabricated by focused ion beam milling, and their magnetic domain configurations were observed with a magnetic force microscope (MFM). The 1× 1 μm2 MnIr/NiFe element has a simple closure domain. The 2× 2 μm2 element also appears to have a flux closure domain configuration, but the configuration is different from that of the NiFe single layer element with the same lateral size. Under the minimum condition of the total magnetic energy, which consists of the exchange coupling energy, the magnetostatic energy and the wall energy, it was considered that the 2× 2 μm2 MnIr/NiFe element was occupied mostly by the domains whose magnetization directions rotate by 40-60 deg from the exchange field direction.

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