Magnetic bar code chip and reading method thereof

Abstract

Disclosed are a magnetic bar code chip and a reading method thereof. The magnetic bar code chip comprises binary information bits formed by N rows and M columns of permanent magnet bars and/or null bits, and information identification bits that are peripheral to the binary information bits. The information identification bits are composed of permanent magnet bar identifiers and used for representing a position and a state of the magnetic bar code chip. The permanent magnet bars and the null bits represent 1 and 0 or 0 and 1 respectively. During reading, a strong magnetic field in a row direction of the binary information bits of the magnetic bar code chip is firstly used to set a magnetization direction of the permanent magnet bars, and then a magnetic bar code reader such as a multi-channel magnetic field gradient sensor, a magneto-optical microscope, a magnetic field monitor, a scanning magnetoresistivemicroscope and the like is used to convert magnetic field distribution information generated by the permanent magnet bars on the magnetic bar code chip into the binary information bits and information identification bits respectively, thus implementing reading on a reading result of the magnetic bar code chip. The present invention has characteristics of a small size and strong security.