Apparatus for controlling and adjusting the magnetic state...

Details Apparatus for controlling and adjusting the magnetic state... Apparatus for controlling and adjusting the magnetic state...

2008-04-08

2008-04-08

LeDynh, Bot (Department: 2862)

Electricity: measuring and testing

Magnetic

Magnetometers

C505S846000, C324S244000, C324S261000

Reexamination Certificate

active

11621260

ABSTRACT:
An apparatus for controlling and adjusting the magnetic state of a magnetic probe for detecting magnetic signals of a sample, it employs a negative feedback control unit to counter the change of magnetization of the magnetic probe. The local magnetic field of the sample influences the magnetization of the magnetic probe. Through the feedback coil inductively coupled to the magnetic probe, the variation of magnetization of the magnetic probe is compensated by the magnetization induced by the feedback coil. This apparatus is capable of reducing the magnetic interaction between the magnetic probe and sample. Meanwhile, a current bias unit is used for adjusting the magnetization of the magnetic probe to an arbitrary value. This capability allows a scanning probe microscope applying this invention to manipulate magnetic objects.

REFERENCES:
patent: 5331491 (1994-07-01), Hayakawa et al.
patent: 6657431 (2003-12-01), Xiao
patent: 6696833 (2004-02-01), Hong et al.
patent: 6717402 (2004-04-01), Mukasa et al.

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