Abstract:
상온 및 상압에서의 단일벽 탄소나노튜브 합성 방법에 관해 개시되어 있다. 개시된 본 발명은 탄소나노튜브 합성에 촉매로써 작용하는 촉매입자가 함유된 유기 금속 화합물과 탄소 공급원을 포함하는 혼합액을 형성하는 제1 단계와, 표면상에서 상기 탄소나노튜브가 합성되는 지지체를 상기 혼합액에 첨가하는 제2 단계와, 상기 지지체가 첨가된 상기 혼합액에 초음파를 조사하는 제3 단계를 포함하는 것을 특징으로 하는 단일벽 탄소나노튜브 합성 방법을 제공한다.
Abstract:
A method for forming a magnetic memory device is provided to improve an etch selectivity between a removed portion of an upper magnetic layer and a tunnel barrier layer by oxidizing selectively the upper magnetic layer using a capping conductive pattern as an oxidation mask. A lower magnetic layer, a tunnel barrier layer(130a) and an upper magnetic layer are sequentially formed on a semiconductor substrate(100). A capping conductive pattern is formed on a predetermined region of the upper magnetic layer. An oxidation is performed on the upper magnetic layer by using the capping conductive pattern as an oxidation mask. At this time, an upper magnetic pattern(132a) is formed under the capping conductive pattern. The tunnel barrier layer and the upper magnetic pattern are selectively exposed to the outside by removing completely an oxidized portion from the upper magnetic layer. The upper magnetic layer contains at least one selected from a group consisting of Fe, Ni, and Co.
Abstract:
A standard sample for transmission electron microscopy (TEM) elemental mapping and a TEM elemental mapping method using the same are provided. The standard sample includes a substrate; a first crystalline thin film containing heavy atoms formed on the substrate; a first amorphous thin film having oxides or nitrides containing light atoms and having a thickness of 1-5 nm or 6-10 nm formed on the first crystalline thin film; a second crystalline thin film containing heavy atoms formed on the first amorphous thin film. The standard sample can be used to correct TEM, EDS and EELS mapping results of a multi-layered nanometer-sized thin film and to optimize mapping conditions.