Presentation Title

Thickness Dependent Magnetic Anisotropy of Dielectric-capped Cobalt

Presenter Information

Erika SanchezFollow

Start Date

November 2016

End Date

November 2016

Location

HUB 302-#160

Type of Presentation

Poster

Abstract

Electric field controlled magnetism is a very interesting and important research topic with many technological applications. One way to achieve such control is through magneto electric coupling in ferroelectric (FE) and ferromagnetic (FM) heterostructures. Inserting a dielectric between the FE and FM layers may enhance the magneto electric coupling in these FE/FM systems. However it is important to understand how the presence of a dielectric will affect the magnetic anisotropy of the FM thin film. This work studied how the magnetic anisotropy of cobalt thin films is modified when capped with dielectric SiO2. Using magneto optic kerr effect (MOKE) measurements we show that 3nm of SiO2 is enough to prevent changes in the magnetic properties of cobalt when exposed to the atmosphere over time. Then the magnetic anisotropy of cobalt was studied as a function of thickness. The spin reorientation transition thickness was found to be ~0.6nm, far less than for cobalt thin films capped with metallic layers. These results lay the groundwork for future dielectric enhanced FE/FM magneto electric coupling experiments.

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Nov 12th, 4:00 PM Nov 12th, 5:00 PM

Thickness Dependent Magnetic Anisotropy of Dielectric-capped Cobalt

HUB 302-#160

Electric field controlled magnetism is a very interesting and important research topic with many technological applications. One way to achieve such control is through magneto electric coupling in ferroelectric (FE) and ferromagnetic (FM) heterostructures. Inserting a dielectric between the FE and FM layers may enhance the magneto electric coupling in these FE/FM systems. However it is important to understand how the presence of a dielectric will affect the magnetic anisotropy of the FM thin film. This work studied how the magnetic anisotropy of cobalt thin films is modified when capped with dielectric SiO2. Using magneto optic kerr effect (MOKE) measurements we show that 3nm of SiO2 is enough to prevent changes in the magnetic properties of cobalt when exposed to the atmosphere over time. Then the magnetic anisotropy of cobalt was studied as a function of thickness. The spin reorientation transition thickness was found to be ~0.6nm, far less than for cobalt thin films capped with metallic layers. These results lay the groundwork for future dielectric enhanced FE/FM magneto electric coupling experiments.