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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
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Nanometer Scale Hard/Soft Bilayer Magnetic Antidots.

Fanny Béron1, Andreas Kaidatzis2, Murilo F Velo3

  • 1Instituto de Física Gleb Wataghin (IFGW), Universidade Estadual de Campinas (UNICAMP), Campinas, SP, 13083-859, Brazil. fberon@ifi.unicamp.br.

Nanoscale Research Letters
|February 14, 2016
PubMed
Summary
This summary is machine-generated.

Arrays of nanometer pores in magnetic thin films influence magnetic behavior. Ordered antidots create a stronger out-of-plane magnetization, affecting magnetic coupling in Co/Py bilayers, especially with thicker soft layers.

Keywords:
Exchange-spring magnetsFirst-order reversal curve (FORC)Magnetic antidot arraysMagneto-optical Kerr effect (MOKE)Structured magnetic thin films

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Nanoporous structures significantly alter the magnetic properties of thin films.
  • Understanding the interplay between nanopore geometry and magnetic behavior is crucial for advanced magnetic devices.

Purpose of the Study:

  • To analyze the effect of nanometer-scale pores on thin film magnetic properties.
  • To investigate how the out-of-plane magnetization component from nanopores influences in-plane magnetic behavior in patterned hard/soft magnetic thin films.
  • To compare the influence of disordered and ordered antidots on magnetic coupling in Co/Py bilayers.

Main Methods:

  • Magneto-optical Kerr effect (MOKE) and first-order reversal curve (FORC) techniques were employed to probe magnetic behavior.
  • Magnetic force microscopy (MFM) was used for imaging the magnetic structures.
  • Analysis focused on Co/Py bilayers with antidot arrays of 35-nm diameter.

Main Results:

  • Ordered antidots generated a stronger out-of-plane magnetization component compared to disordered ones.
  • This induced perpendicular magnetization influenced the hard layer's in-plane magnetic behavior similarly for thin or absent soft layers.
  • The influence varied with a thicker soft layer, suggesting potentially weaker coupling.

Conclusions:

  • The arrangement of nanopores (ordered vs. disordered) critically affects the induced out-of-plane magnetization.
  • The magnetic coupling in Co/Py bilayers is modulated by the nanopore-induced perpendicular magnetization component.
  • The thickness of the soft magnetic layer plays a significant role in the observed magnetic coupling behavior.