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Magneto Optical

July 21st, 2011

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What is magnetization reversal by circularly polarized light;explain more?

Discovered only recently (2006) by C.D. Stanciu and F. Hansteen and published in Physical Review Letters this effect is generally called all-optical magnetization reversal. This magnetization reversal technique refers to a method of reversing magnetization in a magnet simply by circularly polarized light and where the magnetization direction is controlled by the light helicity. In particular, the direction of the angular momentum of the photons would set the magnetization direction without the need of an external magnetic field. In fact, this process could be seen as similar to magnetization reversal by spin injection (see also spintronics). The only difference is that now, the angular momentum is supplied by the circularly polarized photons instead of the polarized electrons.

Although experimentally demonstrated, the mechanism responsible for this all-optical magnetization reversal is not clear yet and remains a subject of debate. Thus, it is not yet clear whether an Inverse Einstein-de Haas effect is responsible for this switching or a stimulated Raman-like coherent optical scattering process. However, because phenomenologically is the inverse effect of the magneto-optical Faraday effect, magnetization reversal by circularly polarized light is referred to as the inverse Faraday effect.

Early studies in plasmas, paramagnetic solids, dielectric magnetic materials and ferromagnetic semiconductors demonstrated that excitation of a medium with a circularly polarized laser pulse corresponds to the action of an effective magnetic field. Yet, before the experiments of Stanciu and Hansteen, all-optical controllable magnetization reversal in a stable magnetic state was considered impossible.

In quantum field theory and quantum chemistry the effect where the angular momentum associated to the circular motion of the photons induces an angular momentum in the electrons is called photomagneton. This axial magnetic field with the origins in the angular momentum of the photons has been sometimes refereed in the literature as the field B.

Magnetization reversal by circularly polarized light is the fastest known way to reverse magnetization, and therefore to store data: magnetization reversal takes place on the femtosecond time scale - that translates to a potential of about 100 TBit/s data storage speeds.

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2 NEW SEALED SONY MAGNETO OPTICAL DISKS 12GB MO Write Once Free Shipping
2 NEW SEALED SONY MAGNETO OPTICAL DISKS 12GB MO Write Once Free Shipping
$9.99
FUJITSU MCR3230SS 23GB 35 SCSI MAGNETO OPTICAL DRIVE with 525 Adapter
FUJITSU MCR3230SS 23GB 35 SCSI MAGNETO OPTICAL DRIVE with 525 Adapter
$65.00
Olympus PowerMO 2600 26GB External SCSI Magneto Optic Drive PMO2600
Olympus PowerMO 2600 26GB External SCSI Magneto Optic Drive PMO2600
$250.00
New Plasmon 201248 000 91GB Magneto Optical Drive 1 yr warranty in box
New Plasmon 201248 000 91GB Magneto Optical Drive 1 yr warranty in box
$695.00
Sony CMO R540 External Magneto Optical Drive White 23 26 Modisk 50 pin SCSI 1
Sony CMO R540 External Magneto Optical Drive White 23 26 Modisk 50 pin SCSI 1
$229.00
HP C7984A 91Gb Rewritable Magneto Optical Disk Cartridge New
HP C7984A 91Gb Rewritable Magneto Optical Disk Cartridge New
$35.00
As Is Powers Up Maxoptix T3 1300 MO Magneto Optical Drive
As Is Powers Up Maxoptix T3 1300 MO Magneto Optical Drive
$29.00
Box of 5 Disks Verbatim 91203 23Gb 512 B S Rewritable Magneto Optical Disk
Box of 5 Disks Verbatim 91203 23Gb 512 B S Rewritable Magneto Optical Disk
$500.00
SONY EDM 1DA1 Magneto Optical Disks 512 bytes Sealed
SONY EDM 1DA1 Magneto Optical Disks 512 bytes Sealed
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NEW 3 PK HP 92280T R W 13GB MO 525 Magneto Optical Disk Rewritable Read Write
NEW 3 PK HP 92280T R W 13GB MO 525 Magneto Optical Disk Rewritable Read Write
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NEW HP C7986A 86GB WORM Write Once 525 MO Magneto Optical Disk Factory Sealed
NEW HP C7986A 86GB WORM Write Once 525 MO Magneto Optical Disk Factory Sealed
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New Plasmon P5200W 52GB WORM 525 Write Once MO Magneto Optical Disk 5 PACK
New Plasmon P5200W 52GB WORM 525 Write Once MO Magneto Optical Disk 5 PACK
$395.00
Sony MO Disk Unit RMO Magneto Optical Drive External 52Gb SCSI RMO S551
Sony MO Disk Unit RMO Magneto Optical Drive External 52Gb SCSI RMO S551
$349.00
Sony EDM 2300C 23GB 512 B S Magneto Optical Disk New Sealed
Sony EDM 2300C 23GB 512 B S Magneto Optical Disk New Sealed
$43.50
Sony Magneto Maxell Ma112 21r Mod 650 512mb Optical Disk Disc Lot Of 14 WORM
Sony Magneto Maxell Ma112 21r Mod 650 512mb Optical Disk Disc Lot Of 14 WORM
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HP 92280F 26GB RW Magneto Optical Media NEW  SEALED
HP 92280F 26GB RW Magneto Optical Media NEW SEALED
$10.00
HP Hewlett Packard 52GB Rewritable Magneto Optical Disk MO 88147J New
HP Hewlett Packard 52GB Rewritable Magneto Optical Disk MO 88147J New
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Lot of 4 Hewlett Packard HP 13GB Rewritable Magneto WORM Optical Disk New
Lot of 4 Hewlett Packard HP 13GB Rewritable Magneto WORM Optical Disk New
$22.95
SONY 52 GB MAGNETO OPTICAL DISK CWO 5200B
SONY 52 GB MAGNETO OPTICAL DISK CWO 5200B
$19.99
Fujitsu M2513A SCSI 35 inch 640MB Magneto Optical Drive No bezel
Fujitsu M2513A SCSI 35 inch 640MB Magneto Optical Drive No bezel
$79.00
NEW Sony RMO S 551 SD MO Disk Unit Magneto Optical 52 GB External Drive NOS
NEW Sony RMO S 551 SD MO Disk Unit Magneto Optical 52 GB External Drive NOS
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Vintage Sony SMO S501 11 Magneto Optical Disk Drive Subsystem
Vintage Sony SMO S501 11 Magneto Optical Disk Drive Subsystem
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Verbatim Magneto Optical Disc Disk Rewritable 26gb Lot of 10
Verbatim Magneto Optical Disc Disk Rewritable 26gb Lot of 10
$23.99
Magneto Optical media 23GB RW re writable P2300E Sony EDM2300CWW
Magneto Optical media 23GB RW re writable P2300E Sony EDM2300CWW
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Plasmon 86GB RW Re writable magneto optical media P8600E Sony EDM8600CWW
Plasmon 86GB RW Re writable magneto optical media P8600E Sony EDM8600CWW
$32.00
New HP C7984A Magneto Optical Disk Write Once 91GB Hewlett Packard WORM
New HP C7984A Magneto Optical Disk Write Once 91GB Hewlett Packard WORM
$45.00
Plasmon 48GB WORM Magneto Optical Disc media P4800WX5 5 pack Sony CWO4800CWW
Plasmon 48GB WORM Magneto Optical Disc media P4800WX5 5 pack Sony CWO4800CWW
$42.00
Sony SMO F541 SMO F544 Magneto Optical Disk Drive Technical Guide Specifications
Sony SMO F541 SMO F544 Magneto Optical Disk Drive Technical Guide Specifications
$10.00
LOT OF 8 Sony EDM 1300B 13Gb Rewritable Magneto Optical Disk Cartridge
LOT OF 8 Sony EDM 1300B 13Gb Rewritable Magneto Optical Disk Cartridge
$25.00
Olympus PowerMO 2600 26GB External SCSI Magneto Optic Drive Model PMO2600
Olympus PowerMO 2600 26GB External SCSI Magneto Optic Drive Model PMO2600
$29.95
5 SONY EDM 1300B SONY MAGNETO 525 OPTICAL DISK 13GB 1024 bytes sector NEW
5 SONY EDM 1300B SONY MAGNETO 525 OPTICAL DISK 13GB 1024 bytes sector NEW
$73.51
Pinnacle Micro Alta 75 Magneto Optical Robotic library with 2 Apex 46GB drives
Pinnacle Micro Alta 75 Magneto Optical Robotic library with 2 Apex 46GB drives
$77.45
Sony EDM 2300C 23Gb 512 B S Rewritable Magneto Optical Disk New
Sony EDM 2300C 23Gb 512 B S Rewritable Magneto Optical Disk New
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Hewlett Packard Magneto Optical DISK R W 52GB 88147J
Hewlett Packard Magneto Optical DISK R W 52GB 88147J
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Sony Magneto Optical disk 48GB rewritable NEW sealed EDM 4800C
Sony Magneto Optical disk 48GB rewritable NEW sealed EDM 4800C
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SONY Magneto Optical Disk CWO 9100C
SONY Magneto Optical Disk CWO 9100C
$15.99
HP Hewlett Packard 52GB Rewritable Magneto Optical Disk MO 88147J New
HP Hewlett Packard 52GB Rewritable Magneto Optical Disk MO 88147J New
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Lot of 5 New Sony Magneto Optical Disk 52GB CWO 5200C F21 04
Lot of 5 New Sony Magneto Optical Disk 52GB CWO 5200C F21 04
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Sony EDM 5200C 52Gb Rewritable Magneto Optical Disk New  Sealed
Sony EDM 5200C 52Gb Rewritable Magneto Optical Disk New Sealed
$52.50

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