Method for Measuring An Electric Property of a Test Sample
AssigneeKLA Corporation
InventorsAlberto Cagliani, Frederik Westergaard Østerberg, Chia-Hung Wei
Life of this patent
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Abstract
The method may be used for measuring an electric property of a magnetic tunnel junction used in an embedded MRAM memory for example. The method uses a multi point probe with a plurality of probe tips for contacting a designated area of the test sample, which is electrically insulated from the part of the test sample which is to be tested. Electrically connections are placed underneath the magnetic tunnel junction and goes to the designated area.
Claims14
A method for measuring an electrical property of a multilayer test sample such as a magnetic tunnel junction, said method comprising:
- providing said multilayer test sample having a stack including at least a first layer and a second layer, said stack being above an electrically insulating layer,
- providing a first test sample terminal above said electrically insulating layer for a first connection with a measurement circuit,
- providing a second test sample terminal above said electrically insulating layer for a second connection with said measurement circuit,
- said first test sample terminal, said second test sample terminal, and said stack being electrically insulated from each other,
- providing a first electrically conductive path embedded in said electrically insulating layer, said first electrically conductive path electrically interconnecting said first test sample terminal and said stack, and
- providing a second electrically conductive path embedded in the electrically insulated layer, said second electrically conductive path electrically interconnecting said second test sample terminal and said stack,
- said method further comprising:
- providing said measuring circuit including a first measuring terminal and a second measuring terminal,
- contacting said first measuring terminal with said first test sample terminal,
- contacting said second measuring terminal with said second test sample terminal, and
- measuring said electric property of said stack by means of said measuring circuit.
A multilayer test sample for embedded measuring of an electrical property of said multilayer test sample, said multilayer test sample comprising:
- a stack including at least a first layer and a second layer, said stack being above an electrically insulating layer,
- a first test sample terminal above said electrically insulating layer for a first connection with a measurement circuit,
- a second test sample terminal above said electrically insulating layer for a second connection with said measurement circuit,
- said first test sample terminal, said second test sample terminal, and said stack being electrically insulated from each other,
- said multilayer test sample further comprising:
- a first electrically conductive path embedded in the electrically insulated layer, said first electrically conductive path electrically interconnecting said first test sample terminal and said stack, and
- a second electrically conductive path embedded in the electrically insulated layer, said second electrically conductive path interconnecting said second test sample terminal and said stack such that said first electrically conductive path and said second electrically conductive path together with said stack form a circuit between said first test sample terminal and said second test sample terminal for measuring said electrically property.
Dependencies are inferred from the claim text.