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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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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
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In electrostatics, the electric field can be written as the negative gradient of the potential. In magnetostatics, the zero divergence of the magnetic field ensures that the magnetic field can be expressed as the curl of a vector potential. This potential is known as the magnetic vector potential.
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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Phase-transforming metamaterial with magnetic interactions.

Xudong Liang1,2, Hongbo Fu3, Alfred J Crosby1

  • 1Polymer Science and Engineering Department, University of Massachusetts, Amherst, MA 01003; liangxudong@hit.edu.cn acrosby@umass.edu.

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We developed elasto-magnetic metamaterials with macroscale phase transformations, enabling tunable energy transduction and mechanical properties for high-rate applications like impact mitigation.

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Area of Science:

  • Materials Science
  • Metamaterials
  • Solid-state Physics

Background:

  • Solid-solid phase transformations are crucial for material properties and energy transduction.
  • Traditional phase transformations occur at atomic/molecular levels.
  • Existing materials include shape memory alloys and liquid crystal elastomers.

Purpose of the Study:

  • To develop elasto-magnetic metamaterials exhibiting macroscale phase transformations.
  • To explore nonlinear interactions between elastic structures and magnetic domains for phase control.
  • To investigate the impact of these transformations on energy transduction and mechanical properties.

Main Methods:

  • Development of elasto-magnetic metamaterials with embedded magnetic domains.
  • Analysis of nonlinear interactions driving phase transitions.
  • Utilizing a Landau free energy-based model for quantitative phase mapping.
  • Characterization of stress-strain relations and energy storage/release capabilities.

Main Results:

  • Demonstrated phase transformation behavior in elasto-magnetic metamaterials.
  • Observed beneficial changes in strain state and mechanical properties.
  • Achieved nonmonotonic stress-strain relations for energy management.
  • Developed a phase map correlating geometry and magnetic interactions to phase transitions.

Conclusions:

  • Elasto-magnetic metamaterials offer controllable phase transitions for enhanced energy management.
  • Programmable material properties are achievable for high-rate applications.
  • Macroscale phase transformations provide a novel pathway for material design and performance tuning.