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An assembly for writing/reading high-density data on a recording media as a series of tags comprising a magnetic information bit pattern. The assembly includes an antenna positionable near the media; a source of electromagnetic radiation for producing an incident wave at least a portion of which can

An assembly for writing/reading high-density data on a recording media as a series of tags comprising a magnetic information bit pattern. The assembly includes an antenna positionable near the media; a source of electromagnetic radiation for producing an incident wave at least a portion of which can be coupled to the antenna; and, a means for coordinating a mutual positioning of the source of the electromagnetic radiation and the antenna, so that the antenna can generate a highly localized electromagnetic field in the vicinity of the media for inducing localized heating of the media. The assembly is capable of writing/erasing said high-density data by using an information signal for modulating the localized field generated in the vicinity of the media; the assembly is capable of reading by coordinating the mutual positioning of the antenna and the media.

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1. An assembly for writing/erasing high-density data on a recording medium as a series of tags comprising a magnetic information bit pattern, the assembly comprising:an antenna positionable near the medium;a source of electromagnetic radiation for producing an incident wave at least a portion of whi

1. An assembly for writing/erasing high-density data on a recording medium as a series of tags comprising a magnetic information bit pattern, the assembly comprising:an antenna positionable near the medium;a source of electromagnetic radiation for producing an incident wave at least a portion of which can be coupled to the antenna to induce an electromagnetic field therein; andmeans for coordinating a mutual positioning of the source of electromagnetic radiation and the antenna, so that the electromagnetic field of the antenna can generate a highly localized electromagnetic field in the vicinity of the medium for inducing localized heating of the media medium due to the highly localized electromagnetic field;the assembly capable of writing/erasing said high-density data by using an information signal for modulating the localized electromagnetic field generated in the vicinity of the medium. 2. An assembly according to claim 1, wherein the antenna has nanometric dimensions. 3. An assembly according to claim 1, wherein the antenna is associated with a recording head. 4. An assembly according to claim 1, wherein the antenna has a size that is smaller than a wavelength λ of the source of electromagnetic radiation. 5. An assembly according to claim 1, wherein the antenna is elongated and has a shape selected from the group consisting of an ellipsoid geometry, a rod, a cylinder, and a pyramid. 6. An assembly according to claim 5, wherein the antenna has at least one sharp point at an end, the radius of the point being from 10 nm to 100 nm. 7. An assembly according to claim 1, wherein the antenna material has a high dielectric index. 8. An assembly according to claim 1, wherein the antenna comprises a magnetic material. 9. An assembly according to claim 1, wherein the source of electromagnetic radiation is within the optical portion of the electromagnetic spectrum. 10. An assembly according to claim 1, wherein the source of electromagnetic radiation is within the ultra-violet portion of the electromagnetic spectrum. 11. An assembly according to claim 1, wherein the source of electromagnetic radiation is within the infra-red portion of the electromagnetic spectrum. 12. An assembly according to claim 1, wherein the means for coordinating the mutual positioning of the source of electromagnetic radiation and the antenna comprises an air-bearing mechanism. 13. An assembly according to claim 1, wherein the means for coordinating the mutual positioning of the source of the electromagnetic radiation and the antenna enables the antenna to generate a substantially near-field electromagnetic coupling between the antenna and the medium. 14. An assembly according to claim 1, further comprising means for applying a magnetic bias field on the medium. 15. An assembly according to claim 14, further comprising means for using an information signal for modulating the magnetic bias field, to thereby write/erase high density data on the medium. 16. An assembly according to claim 1, further comprising a sensor, and wherein the assembly is capable of reading high-density data from the recording medium by coordinating the mutual position of the sensor and the medium. 17. An assembly according to claim 16, wherein the sensor reads by magnetic sensitive sensing. 18. An assembly according to claim 16, wherein the sensor reads by magnetic force sensing. 19. An assembly according to claim 16, wherein the sensor reads by magnetic tunneling sensing. 20. An assembly according to claim 16, wherein the sensor reads by near-field optical sensing. 21. An assembly according to claim 16, wherein the sensor reads by magnetic induction sensing. 22. A method for writing/erasing high-density data on a recording medium as a series of tags comprising a magnetic information bit pattern, the method comprising:positioning an antenna near the medium;generating an incident electromagnetic wave for coupling to the antenna;coordinating a mutual positioning of the incident elec tromagnetic wave and the antenna for generating a highly localized electromagnetic field in the vicinity of the medium, for thereby inducing localized heating of the medium due to the highly localized electromagnetic field; andwriting/erasing said high-density data by using an information signal for modulating the localized electromagnetic field generated in the vicinity of the medium. 23. A method according to claim 22, wherein the antenna has nanometric dimensions. 24. A method according to claim 22, wherein the antenna comprises a magnetic material. 25. A method according to claim 22, wherein said generating comprises using a laser for generating the incident electromagnetic wave. 26. A method according to claim 22, wherein said generating comprises generating the incident electromagnetic wave for coupling to the antenna along its long axis. 27. A method according to claim 22, wherein said generating comprises generating the incident electromagnetic wave for coupling to the antenna, wherein the antenna is vertical and illumination is from the side with a plane wave and vertical polarization. 28. A method according to claim 22, wherein said generating comprises generating the incident electromagnetic wave for coupling to the antenna, wherein the antenna is tilted over the medium, and illumination is from the top with a plane wave, with polarization along the length of the antenna. 29. A method according to claim 22, wherein said coordinating comprises coordinating the mutual positioning of the incident electromagnetic wave and the antenna for generating a substantially near-field electromagnetic coupling between the antenna and the medium. 30. A method according to claim 22, further comprising applying a magnetic bias field on the medium so that writing/erasing high-density data is enabled by using an information signal for modulating the magnetic bias field. 31. A method according to claim 22, further comprising providing a magnetic bias field on the medium by magnetizing the anntenna and positioning the magnetized antenna near the medium. 32. A method according to claim 22, further comprising:positioning a sensor near the medium; andreading high density data from the medium via the sensor. 33. A method according to claim 22, further comprising selecting at tip for the antenna to match a radiation wavelength of the localized electromagnetic field.