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The effect of interface anisotropy on demagnetization progress in perpendicularly oriented hard/soft exchange-coupled

Qian Zhao1, Jun Chen1, Jiaqi Wang1

  • 1Inner Mongolia Key Laboratory for Utilization of Bayan Obo Multi-Metallic Resources; Elected State Key Laboratory; Department of Applied Physics, College of Science, Inner Mongolia University of Science and Technology, Baotou, 014010, China.

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Interface anisotropy significantly impacts the nucleation field in hard/soft multilayers, affecting magnetic properties. Avoiding negative interface anisotropy is crucial for optimal performance in experimental applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Magnetism

Background:

  • Hard/soft multilayers are critical for magnetic storage devices.
  • Perpendicular crystalline anisotropy is essential for high-density data storage.
  • Interface anisotropy plays a significant role in magnetic multilayer behavior.

Purpose of the Study:

  • To investigate the demagnetization process in hard/soft multilayers.
  • To analyze the influence of interface anisotropy on magnetic properties.
  • To derive analytical expressions for nucleation fields.

Main Methods:

  • Micromagnetic modeling was employed to simulate demagnetization.
  • Microscopic and macroscopic hysteresis loops were calculated.
  • Angular distributions of magnetization were analyzed.

Main Results:

  • Interface anisotropy significantly affects the nucleation field, especially with thin soft layers.
  • A linear relationship was found between nucleation field and interface anisotropy.
  • Positive interface anisotropy enhances remanence and energy products, while negative anisotropy degrades them.

Conclusions:

  • Interface anisotropy is a key factor influencing nucleation fields in magnetic multilayers.
  • Experimental designs should avoid negative interface anisotropy to optimize performance.
  • The micromagnetic model accurately predicts experimental observations.