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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

2.9K
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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Magnetic Damping01:17

Magnetic Damping

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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

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An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Tunable Magnetoelastic Effects in Voltage-Controlled Exchange-Coupled Composite Multiferroic Microstructures.

Z Xiao1,2, R Lo Conte3, M Goiriena-Goikoetxea3,4

  • 1Department of Electrical and Computer Engineering , University of California, Los Angeles , Los Angeles 90095 , California , United States.

ACS Applied Materials & Interfaces
|January 14, 2020
PubMed
Summary
This summary is machine-generated.

Investigating Ni/CoFeB multiferroic microstructures reveals thickness ratio impacts magnetoelastic effects. Symmetric structures exhibit unique interfacial behavior, promising for next-gen magnetoelectric memory devices.

Keywords:
XMCD−PEEM imagingcomposite filmsexchange-coupledmagnetic domainsmagnetic microstructuresmagnetic propertiesmagnetoelasticmagnetoelectricmultiferroicvoltage-controlled

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Magnetoelectric (ME) multiferroic materials offer pathways to novel electronic devices.
  • Understanding the interplay of magnetic and electric properties in composite systems is crucial.
  • Exchange-coupled bilayers present complex phenomena beyond simple additive effects.

Purpose of the Study:

  • To investigate the magnetoelectric properties of exchange-coupled Ni/CoFeB composite multiferroic microstructures.
  • To determine the influence of layer thickness ratios on magnetoelastic effects.
  • To explore emergent interfacial behaviors in symmetric and ultrathin bilayers.

Main Methods:

  • Fabrication and characterization of Ni/CoFeB composite microstructures.
  • Analysis of magnetoelastic effects as a function of layer thickness.
  • Investigation of interfacial exchange coupling effects on magnetic behavior.

Main Results:

  • Magnetoelastic effect strength and sign are strongly correlated with the Ni/CoFeB thickness ratio.
  • Thicker layers dominate magnetoelastic behavior when thickness ratios deviate from one.
  • Symmetric structures (ratio=1) display emergent interfacial behavior not predictable from individual layers.
  • Exchange coupling significantly modifies Ni layer magnetic behavior in ultrathin bilayers.

Conclusions:

  • Composite multiferroic systems offer rich, tunable properties compared to single magnetic layers.
  • Ni/CoFeB bilayers exhibit promising synthetic magnetic system characteristics.
  • Findings are relevant for developing ultralow-power magnetoelectric memory devices due to CoFeB's spintronic compatibility.