Laser assisted magnetic recording properties using SiAg near-field super-resolution structure

Laser assisted magnetic recording properties were obtained by SiAg nonmagnetic mask layer combined near-field coupled super-resolution technique. The film structure was "Glass/SiN(30nm)/SiAg(20nm)/SiN(20nm)/TbFeCo(50nm)/SiN(10nm)". SiN and TbFeCo films were prepared by Radio frequency (RF) and Direct current (DC) magnetron sputtering respectively. The SiAg nonmagnetic mask layer was deposited by co-sputtering from a composite target. In the process of sputtering, the substrate negative DC bias voltage was kept at about 100V. Magnetic properties were obtained by vibrating sample magnetometer(VSM) and the magneto optical Kerr measurement. The magnetic recording was conducted by a home-made laser-assisted optic-magnetic hybrid recording setup, whose laser wavelength is 406.7nm and numerical aperture of converging lens is 0.80, respectively. The optical spot size is about 600nm. In the course of recording, the laser pulse was fixed at 100ns, and the magnetic field intensity was 300 Oe. The magnetic domains with a size of about 100nm were obtained, which is about 1/6 of the optical spot size. The analysis indicates that the SiAg nonmagnetic mask layer played a key role in reducing the magnetic domain size.

[1]  Yihong Wu,et al.  Read‐only optical disk with superresolution , 1994 .

[2]  Costas P. Grigoropoulos,et al.  MECHANISM OF BUMP FORMATION ON GLASS SUBSTRATES DURING LASER TEXTURING , 1999 .

[3]  H. Saga,et al.  Recording Characteristics of Flux-detectable Magneto-optical Recording Media , 2001 .

[4]  Shigeru Tsunashima,et al.  Magneto-optical recording , 2001 .

[5]  Masahiko Takahashi,et al.  New Recording Method Combining Thermo-Magnetic Writing and Flux Detection , 1999 .

[6]  M. Takahashi,et al.  New Recording Method Combining Thermo-Magnetic Writing and Flux Detection , 1999, IEEE International Magnetics Conference.

[7]  B. G. Huth.  Calculations of Stable Domain Radii Produced by Thermomagnetic Writing , 1974 .

[8]  J. Rinehart,et al.  U . S . Patent , 2006 .

[9]  SIMULATION OF THERMOMAGNETIC RECORDING USING EXTENDED HUTH’S EQUATION , 2001 .

[10]  Jingsong Wei,et al.  Laser pulse induced bumps in chalcogenide phase change films , 2008 .

[11]  Jun Shen,et al.  Three‐dimensional model for cw laser‐induced mode‐mismatched dual‐beam thermal lens spectrometry and time‐resolved measurements of thin‐film samples , 1994 .

[12]  J. Tominaga,et al.  Magneto-optical disk properties enhanced by a nonmagnetic mask layer , 2000 .

[13]  Yihong Wu,et al.  Calculations on modulation transfer function of a read‐only optical disk system with super resolution , 1995 .

[14]  Optical and Thermal Simulator for Laser-assisted Magnetic Recording , 2007 .

[15]  M. Kryder,et al.  Near‐field magneto‐optics and high density data storage , 1992 .

[16]  Kenji Ohta,et al.  New Magnetic Recording Method Using Laser Assisted Read/Write Technologies , 1999 .

[17]  Mary Frances Doerner,et al.  Correlation of thermal stability and signal-to-noise ratio of thin film recording media , 2000 .

[18]  C. Chong,et al.  Theoretical analysis of a thermally induced superresolution optical disk with different readout optics. , 1997, Applied optics.

[19]  Leonid V. Zhigilei,et al.  Combined atomistic-continuum modeling of short-pulse laser melting and disintegration of metal films , 2003 .

[20]  Feng Zhang,et al.  Super-resolution with a nonlinear thin film: Beam reshaping via internal multi-interference , 2006 .