Patent ID: 9741453
Date: 2017-08-22
CPC Classifications: G01R,G11C

Claim:
1. A prober chuck for a magnetic memory, retaining a wafer having a magnetic memory formed thereon, the prober chuck comprising: a chuck top that is made of a conductive material and has the wafer placed thereon; an insulating layer that is made of an insulating material and is adapted to support the bottom surface of the chuck top; a guard layer that is made of a conductive material and is arranged under the insulating layer, the guard layer being insulated from the chuck top via the insulating layer, a second insulating layer that is made of an insulating material and is arranged under the guard layer; and a ground layer that is made of a conductive material and is arranged under the second insulating layer, the ground layer being insulated from the guard layer via the second insulating layer wherein the chuck top and the guard layer are made of a non-magnetic material, and the insulating layer and the second insulating layer are formed in a size larger than the guard layer, and further, an area without the guard layer is defined between the insulating layer and the second insulating layer, and a non-magnetic fixing portion for fixing both of the insulating layers to each other is disposed at the area.