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Ferromagnetism

Ferromagnetism

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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Fabrication of Magnetic Nanostructures on Silicon Nitride Membranes for Magnetic Vortex Studies Using Transmission Microscopy Techniques

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Magnetically controllable silicon microring with ferrofluid cladding.

A El Amili, M C M M Souza, F Vallini

|December 2, 2016

Summary

This summary is machine-generated.

We show that magnetic fluids (MFs) can actively control silicon photonics. Applying a magnetic field to a ferrofluid-clad resonator shifts its optical resonances, enabling new magnetically tunable devices.

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Area of Science:

Photonics
Materials Science
Nanotechnology

Background:

Integrated silicon photonics offers miniaturization and scalability for optical systems.
Magnetic fluids (MFs) possess tunable optical properties influenced by external magnetic fields.
Controlling optical resonances in silicon photonic devices is crucial for tunable functionalities.

Purpose of the Study:

To experimentally investigate the integration of magnetic fluids with silicon photonics.
To demonstrate active control of optical resonances using magnetic fields.
To explore potential applications in magnetically controllable optical devices and sensors.

Main Methods:

Fabrication of a ferrofluid-clad silicon microring resonator.
Application of an external magnetic field to modulate the MFs.
Measurement of resonance shifts and optical quality factors.

Main Results:

Achieved loaded quality factors of approximately 6000.
Demonstrated resonance shifts of 185 pm with a 110 Oe magnetic field.
Quantified a refractive index change of -3.2×10^-3 in the MF cladding.

Conclusions:

Magnetic fluids enable active, magnetically controlled tuning of silicon photonic resonators.
This integration holds promise for developing novel optical devices and compact magnetic field sensors.