Crystallization Dynamics of Amorphous Yttrium Iron Garnet Thin Films

Abstract

Yttrium iron garnet (YIG) is a prototypical material in spintronics due to its exceptional magnetic properties. To exploit these properties high quality thin films need to be manufactured. Deposition techniques like sputter deposition or pulsed laser deposition at ambient temperature produce amorphous films, which need a post annealing step to induce crystallization. However, not much is known about the exact dynamics of the formation of crystalline YIG out of the amorphous phase. Here, we conduct extensive time and temperature series to study the crystallization behavior of YIG on various substrates and extract the crystallization velocities as well as the activation energies needed to promote crystallization. We find that the type of crystallization as well as the crystallization velocity depend on the lattice mismatch to the substrate. We compare the crystallization parameters found in literature with our results and find an excellent agreement with our model. Our results allow us to determine the time needed for the formation of a fully crystalline film of arbitrary thickness for any temperature.

References in corpus (13)

• Long distance transport of magnon spin information in a magnetic insulator at room temperature
• Quantitative study of the spin Hall magnetoresistance in ferromagnetic insulator/normal metal hybrids
• Inverse Spin Hall Effect in nanometer-thick YIG/Pt system
• Strain-Tunable Magnetocrystalline Anisotropy in Epitaxial Y3Fe5O12 Thin Films
• Large Spin Pumping from Epitaxial Y3Fe5O12 Thin Films to Pt and W Layers
• Low damping and microstructural perfection of sub-40nm-thin yttrium iron garnet films grown by liquid phase epitaxy
• Increased low-temperature damping in yttrium iron garnet thin films
• Monocrystalline free standing 3D yttrium iron garnet magnon nano resonators
• Spin current generation from sputtered Y3Fe5O12 films
• Spin waves in micro-structured yttrium iron garnet nanometer-thick films
• Unexpected structural and magnetic depth dependence of YIG thin films
• Epitaxial patterning of nanometer-thick Y3Fe5O12 films with low magnetic damping
• Patterned growth of crystalline Y${}_3$Fe${}_5$O${}_{12}$ nanostructures with engineered magnetic shape anisotropy