Kozi Nishida

Evaluating of Diamond Like Carbon Using Deep UV Raman Spectroscopy

Deep UV Raman spectroscopy is expected as a technique to evaluate diamond like carbon (DLC) because it observes sp3 bonds peak, called T-peak, and sp2 bonds, called G-peak, directly. To use the advantage of deep UV Raman spectroscopy, we show the evaluation of sp2 bonds rich DLC, called a-C:H, and several type of sp3 bond rich, called ta-C. The a-C:H samples are thermal treatment sample which are evaluated by visible Raman on empirical rule. These were evaluated by Deep UV Raman. It is considered that Deep UV Raman spectroscopy is versatile technique for evaluating diamond like carbon.

In-situ Raman Spectroscopic Investigation of the Effect of Cooling Speed on Domain Formation in PbTiO3 Films

The influence of the post-deposition cooling speed on the domain formation process of PbTiO3 films was investigated using MOCVD equipment combined with in-situ Raman spectroscopy. The accumulation and relaxation of strain during the post-deposition cooling process is responsible for the domain structure. The Curie temperature for fast cooling is lower than that for slow cooling. Additionally, the residual strain with fast cooling is smaller than that with slow cooling. These observations suggest that the volume fraction of the c-domain is larger for fast cooling and that the atmospheric conditions during the first post-deposition cooling process may control the domain structure.

Structural Investigation of Highly Polarized Single-c-Domain thin Films Grown by Magnetron Sputtering with Raman Spectroscopy

Single-c-domain/single-crystal PZT thin films grown by rf magnetron sputtering on SrRuO3/Pt/MgO substrates was investigated by Raman spectroscopy. The Raman spectroscopy measurement revealed that the sputter deposited thin film has high quality and highly c domain oriented. In addition, Raman spectroscopy revealed the local strain configuration in the sputtered thin films from the surface to the substrates. These local stresses were discussed with dielectric property.