Method of forming magnetic patterns, and method of manufacturing magnetic memory devices
First Claim
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1. A method of manufacturing a magnetic memory device, the method comprising:
- forming a first magnetic layer, a tunnel barrier layer, a second magnetic layer, and a metal mask sequentially on a substrate;
forming a magnetic tunnel junction (MTJ) structure by etching the second magnetic layer, the tunnel barrier layer, and the first magnetic layer using the metal mask; and
removing an etching residue from a sidewall of the MTJ structure using a cleaning composition that is devoid of water, wherein the cleaning composition includes;
a glycol ether-based organic solvent,a decomposing agent that includes an aliphatic amine, andat least one of;
a chelating agent, ora cleaning accelerator that includes an organic alkaline compound,wherein the etching residue includes a metal complex formed from a combination of at least two metal species,wherein removing the etching residue includes separating the metal complex into assemblies by the decomposing agent, each of the assemblies including an individual metal of the metal species, andwherein the metal complex includes at least one of tungsten-titanium-cobalt, tungsten-titanium-cobalt-iron, or tungsten-titanium-ruthenium-cobalt.
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Abstract
A composition for cleaning a magnetic pattern, a method of manufacturing a magnetic memory device, a method of forming a magnetic pattern, and a magnetic memory device, the composition including a glycol ether-based organic solvent; a decomposing agent that includes an aliphatic amine; and at least one of a chelating agent, or a cleaning accelerator that includes an organic alkaline compound, wherein the composition is devoid of water.
48 Citations
20 Claims
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1. A method of manufacturing a magnetic memory device, the method comprising:
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forming a first magnetic layer, a tunnel barrier layer, a second magnetic layer, and a metal mask sequentially on a substrate; forming a magnetic tunnel junction (MTJ) structure by etching the second magnetic layer, the tunnel barrier layer, and the first magnetic layer using the metal mask; and removing an etching residue from a sidewall of the MTJ structure using a cleaning composition that is devoid of water, wherein the cleaning composition includes; a glycol ether-based organic solvent, a decomposing agent that includes an aliphatic amine, and at least one of; a chelating agent, or a cleaning accelerator that includes an organic alkaline compound, wherein the etching residue includes a metal complex formed from a combination of at least two metal species, wherein removing the etching residue includes separating the metal complex into assemblies by the decomposing agent, each of the assemblies including an individual metal of the metal species, and wherein the metal complex includes at least one of tungsten-titanium-cobalt, tungsten-titanium-cobalt-iron, or tungsten-titanium-ruthenium-cobalt. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of forming a magnetic pattern, the method comprising:
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forming a layer stack structure such that the layer stack structure includes at least one magnetic layer, at least one metal oxide layer, and at least one metal layer; etching the layer stack structure to form a magnetic pattern; removing a metallic etching residue from a sidewall of the magnetic pattern using a cleaning composition that is devoid of water, wherein the cleaning composition includes; a glycol ether-based organic solvent, a decomposing agent that includes an aliphatic amine, and at least one of; a chelating agent, or a cleaning accelerator that includes an organic alkaline compound, and rinsing a residue of the metallic etching residue or the cleaning composition using an alcohol-based rinse solution. - View Dependent Claims (14)
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15. A method of manufacturing a magnetic memory device, the method comprising:
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providing a substrate; sequentially forming a first magnetic layer, a tunnel barrier layer, a second magnetic layer, and a metal mask on the substrate; forming a magnetic tunnel junction (MTJ) structure by etching the second magnetic layer, the tunnel barrier layer, and the first magnetic layer using the metal mask; and removing an etching residue from a sidewall of the MTJ structure using a cleaning composition, wherein the cleaning composition has a pH of about 9 to about 12.5 and includes; a glycol ether-based organic solvent, a decomposing agent that includes an aliphatic amine, and at least one of; a chelating agent, or a cleaning accelerator that includes an organic alkaline compound. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification