Magnetization device for an electron microscope and method

Patent metadata

Field	Value
Publication number	US-2024258064-A1
Application number	US-202118578561-A
Country	US
Kind code	A1
Filing date	Aug 20, 2021
Priority date	Aug 20, 2021
Publication date	Aug 1, 2024
Grant date	—

Abstract

The disclosure refers to a magnetization device, and an associated method of operation, for an electron microscope that includes a coil, with a yoke carrying the coil, with a sample holder for holding a sample, and with two poles of the yoke adjoining the sample holder. A gap is present in the yoke between each pole and the coil. A sample is placed on the sample holder by means of an optical microscope and subsequently the part of the magnetization device comprising the sample holder is connected to the part of the magnetization device comprising one or more coils.

First claim

1 . A magnetization device comprising: a coil, a yoke carrying the coil, a sample holder for holding a sample, and two poles of the yoke adjoining the sample holder, wherein a gap is present in the yoke between each pole and the coil.

2 . The magnetization device according to claim 1 , wherein the sample holder is rotatably mounted.

3 . The magnetization device according to claim 1 , characterized in that wherein the yoke has three poles, the three poles being adjacent to the sample holder, and three coils being associated with respective ones of the three poles.

4 . The magnetization device according to claim 3 , wherein two of the three poles are adjacent to the sample holder on opposite sides and a third pole of the three poles is adjacent to an end of the sample holder.

5 . The magnetization device according to claim 3 , wherein there are a plurality of gaps in the yoke between the three coils and respective ones of the three poles.

6 . The magnetization device according to claim 5 , wherein a given gap of the plurality of gaps separating a given pole of the three poles from a corresponding coil of the three coils is container-shaped.

7 . The magnetization device according to claim 3 , wherein a particular gap separating an outer pole from a particular coil of the three coils is rectilinear in section.

8 . The magnetization device according to claim 3 , wherein the yoke comprises three bars and each bar carries a coil.

9 . The magnetization device according to claim 3 , wherein the yoke comprises four parts.

10 . The magnetization device according to claim 3 , wherein parts of the yoke can be rotated together with the sample holder.

11 . The magnetization device according to claim 1 , wherein a part of the yoke carrying the coil is separable from the sample holder.

12 . The magnetization device according to claim 1 , wherein there are two outer yokes, each carrying a coil and facing each other.

13 . The magnetization device according to claim 1 , wherein a passage for an electron beam is provided in such a way that a sample held by the sample holder can be microscoped by the electron beam, wherein the passage for the electron beam passes through two outer yokes.

14 . The magnetization device according to claim 13 , wherein the two outer yokes have respective gaps as part of the passage.

15 . The magnetization device according to claim 1 , wherein a thickness of a section of the magnetizing device is less than 20 mm, wherein the section comprises the sample holder.

16 . The magnetization device according to claim 1 , wherein a thickness of one or more gaps is less than 0.5 mm.

17 . The magnetization device according to ene of claim 1 , wherein the magnetizing device comprises a heat sink formed from copper or aluminium.

18 . An electron microscope comprising the magnetizing device according to claim 1 .

19 . The magnetization device according to claim 1 , wherein the yoke consist of permalloy and/or Vacoflux®.

20 . A method of operation of a magnetization device, wherein the magnetization device comprises a coil, a yoke carrying the coil, and a sample holder for holding a sample, wherein two poles of the yoke are adjacent to the sample holder, wherein a gap is present in the yoke between each pole and the coil, wherein at least a part of the yoke carrying one or more coils is separated from a part of the magnetization device comprising the sample holder, wherein a sample is placed on the sample holder using an optical microscope and subsequently the part of the magnetization device comprising the sample holder is connected to the part of the magnetization device comprising one or more coils.

Assignees

• Forschungszentrum Juelich Gmbh

Inventors

• Tavabi Amir Hossein
• Soltner Helmut
• Schaaf Michael
• Kruth Maximilian
• Dunin-Borkowski Rafal Edward

Classifications

• H01J2237/2802

  Transmission microscopes · CPC title

• H01J2237/2001

  Maintaining constant desired temperature · CPC title

• H01J37/1471

  for centering, aligning or positioning of ray or beam · CPC title

• H01J2237/2008

  specially adapted for studying electrical or magnetical properties of objects · CPC title

• H01J37/20 Primary

  Means for supporting or positioning the object or the material; Means for adjusting diaphragms or lenses associated with the support · CPC title