Pressure sensor
First Claim
1. A pressure sensor, comprising:
- a support member including silicon;
a membrane supported by the support member, the membrane being flexible, the membrane including a first portion and a second portion, the first portion overlapping the support member in a first direction, the second portion not overlapping the support member in the first direction, the second portion including a central part and an edge part located around the central part, a first thickness of the central part along the first direction being thinner than a second thickness of the edge part in the first direction; and
a strain detection element provided on the membrane at the edge part, the strain detection element includinga first magnetic layer,a second magnetic layer apart from the first magnetic layer in the first direction, andan intermediate layer provided between the first magnetic layer and the second magnetic layer,an electrical resistance of the strain detection element being configured to change depending on a strain of the membrane, wherein the strain detection element operates based on the magnetoresistive effect.
1 Assignment
0 Petitions
Accused Products
Abstract
A pressure sensor according to an embodiment includes: a support member; a membrane supported by the support and having flexibility; and a strain detection element formed on the membrane. The strain detection element includes a first magnetic layer formed on the membrane and having a magnetization, a second magnetic layer having a magnetization, and an intermediate layer formed between the first magnetic layer and the second magnetic layer. A direction of at least one of the magnetization of the first magnetic layer and the magnetization of the second magnetic layer changes relatively to that of the other depending on a strain of the membrane. Moreover, the membrane includes an oxide layer that includes aluminum.
-
Citations
19 Claims
-
1. A pressure sensor, comprising:
-
a support member including silicon; a membrane supported by the support member, the membrane being flexible, the membrane including a first portion and a second portion, the first portion overlapping the support member in a first direction, the second portion not overlapping the support member in the first direction, the second portion including a central part and an edge part located around the central part, a first thickness of the central part along the first direction being thinner than a second thickness of the edge part in the first direction; and a strain detection element provided on the membrane at the edge part, the strain detection element including a first magnetic layer, a second magnetic layer apart from the first magnetic layer in the first direction, and an intermediate layer provided between the first magnetic layer and the second magnetic layer, an electrical resistance of the strain detection element being configured to change depending on a strain of the membrane, wherein the strain detection element operates based on the magnetoresistive effect. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
Specification