Title:
MRAM-BASED CHIP IDENTIFICATION WITH FREE RANDOM PROGRAMMING
Document Type and Number:
WIPO Patent Application WO/2022/247522
Kind Code:
A1
Abstract:
A magnetoresistive random access memory (MRAM) device having chip identification using normal operating voltages is provided. No dedicated programming is needed. Instead, programming of the MRAM device is free and random and is a result of providing a magnetic via structure sufficiently close to the magnetic free layer of the magnetic junction tunnel (MTJ) structure such that the magnetic via structure projects a magnetic field that interacts with the magnetic free layer and aligns the magnetization of the magnetic free layer with the magnetization of the magnetic via structure. Thus, the orientation of the magnetization of both the magnetic via structure and the magnetic free layer are aligned in a same direction. The magnetization of the magnetic via structure can thus be used as a physical unclonable function and the MTJ structure can be used to read out this information.
Inventors:
CHENG KANGGUO (US)
HOUSSAMEDDINE DIMITRI (US)
FROUGIER JULIEN (US)
XIE RUILONG (US)
HOUSSAMEDDINE DIMITRI (US)
FROUGIER JULIEN (US)
XIE RUILONG (US)
Application Number:
PCT/CN2022/087375
Publication Date:
December 01, 2022
Filing Date:
April 18, 2022
Export Citation:
Assignee:
IBM (US)
IBM CHINA CO LTD (CN)
IBM CHINA CO LTD (CN)
International Classes:
H01L43/02
Foreign References:
| US20210020827A1 | 2021-01-21 | |||
| US20200005861A1 | 2020-01-02 | |||
| US10763425B1 | 2020-09-01 | |||
| US20200152699A1 | 2020-05-14 |
Attorney, Agent or Firm:
LIU, SHEN & ASSOCIATES (CN)
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