Samofalov V. Strong stray fields in sistems of magnets with giant anisotropy

Object: of investigation: - strong stray field with strength Н > 4РіMs, generated by permanent magnets with giant magnetic anisotropy. The aim is to determine general physical regularities which provide appearance and stability of the strong stray fields with induction B > Bs = 4PiMs in the systems of magnets with giant magnetic anisotropy. Methods: calculations of the strong stray fields and measurements of the strong stray fields using film. magneto-resistive sensors and EPR spectrometer. Results: The possibility is grounded and the physical conditions are determined for appearance of the strong stray fields with strength H > 4PiMs in different types of magnets both with homogeneous and non-homogeneous magnetization distribution. Using direct measurements of stray fields with help of magneto-resistive sensors and EPR spectrometer, the stray fields twice exceeding the values of saturation induction for the magnet material used were registered. The correspondence of experimental values of the strayfield with the calculated logarithmic dependence was established. It was shown that using the systems of permanent magnets with giant magnetic anisotropy, it is possible to create the fields with record high gradients. The possibility of creation of EPR microscope for studying the physical characteristics from local areas of various materials was grounded. Area of application: physics of magnetic phenomena, technique for information magnetic recording.