Specialise Instruments

PRODUCTS

MAGNETO-OPTICAL MICROSCOPY

	·	ATOMIC LAYER DEPOSITION
	·	CCD, EMCCD,ICCD SPECTROGRAPHS
	·	CRYOGENIC PROBE STATIONS
	·	CRYOGENICS AND MAGNETS
	·	CW Ti-SAPPHIRE AND DYE LASER
	·	ELECTRON AND ION DETECTORS
	·	FAST FRAME RATE ICCD
	·	GAS LASERS
	·	HIGH SPEED VIDEO CAMERA
	·	INFRARED SYSTEMS
	·	LN COOLED CCD
	·	MAGNETIC AND PHYSICAL PROPERTY MEASUREMENT
	·	NANOLITHOGRAPHY
	·	NANOPOSITIONING, MICROSCOPY, CRYOGENICS
	·	OPO OPTICAL PARAMETRIC OSCILLATOR
	·	PULSED LASERS
	·	SAM SCANNING ACOUSTO OPTIC MICROSCOPE
	·	SPECTRORADIOMETERS
	·	SPM SCANNING PROBE (LOW TEMPERATURE AND ROOM TEMPERATURE) MICROSCOPE
	·	SURFACE SCIENCE INSTRUMENTS
	·	THIN FILM DEPOSITION SYSTEMS
	·	VSM VIBRATION SAMPLE MAGNETOMETER
	·	WAVEMETERS
	·	XRD XRAY DIFFRACTOMETERS

Bz(x) across a region of a prerecorded magnetic tape. (a) Schematic of MOM setup consisting of, lamp (L), linear polarizer (P), beam splitter (B), objective (O), MOM indicator film (V), tape (T), analyzer (A). Also indicated is the local magnetic field direction (Bz). The blow up shows the state of linear polarization in the incident (blue) and reflected beam (red). (b) MOM image of a prerecorded magnetic tape.
The MOM setup was built at IIT Kanpur. The CCD used in the setup is a Peltier cooled Charge Coupled Device (CCD) camera (Andor,iXon, 512 x 512 pixels, 16 bit, 85% quantum efficiency at 550 nm).

(a) MOM image of six locations on the irradiated tape. (b) Behavior of Bz (across the solid line in Fig. 2(a). (c) Magnified MOM image of a single irradiated spot (refer dotted black circled region in Fig.2(a). (d) Contour map of Bz(x, y) around the spot shown in (c).

(a) Effect of terawatt laser pulse irradiation on a prerecorded magnetic tape (b) M-H hysteresis loop of the tape.

(a) MOM image of irradiated regions on the tape. (b) derivative of the MO image shown in (a). The red dashed circle schematically represents circulation of azimuthal currents responsible for the axial fields. (c) Log(Bz + 100 G) vs Log(d) variation far away from the laser irradiated spot. Inset shows the schematic of 2D current sheet, J(r) (a model for horizontal cross section of plasma vortex) (d) Log(Bz + 100 G) vs d variation close to irradiation spot.