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MA: Fachverband Magnetismus

MA 55: Thin Films: Magnetic Anisotropy

MA 55.4: Vortrag

Donnerstag, 23. März 2017, 15:45–16:00, HSZ 101

Epitaxial YCo₅ thin films with perpendicular anisotropy — •Shalini Sharma, Erwin Hildebrandt, Iliya Radulov, and Lambert Alff — Institute of Materials Science, Technische Universität Darmstadt, 64287 Darmstadt, Germany

Thin films with perpendicular magnetic anisotropy are particularly important for high-density perpendicular magnetic recording media, magneto-optical recording media, and recently emerging nano-scale spintronic devices. One approach to achieve this is the c-axis (easy axis) textured growth of materials which possess strong intrinsic magnetocrystalline anisotropy that is large enough to overcome the shape anisotropy of thin films. This work is focused on growing thin films of YCo₅ which possesses a very strong uniaxial magnetocrystalline anisotropy (K₁ of 5.78 MJ/m³) as bulk phase. We have explored the growth window of (00l) oriented YCo₅ thin films grown onto (0006) Al₂O₃ substrates by molecular beam epitaxy (MBE). The hexagonal YCo₅ phase grows with the c-axis perpendicular to the film plane without the use of any additional buffer layer. The highest coercivity was measured to be 4 kOe with a saturation magnetization of 517 emu/cc at 300 K. This is the highest value of magnetization ever reported for YCo₅ thin films. Magnetic torque measurements were used to calculate the value of anisotropy constant, K₁.