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Method for preparing monomolecular magnet (Mn1-XCrX)12-ac

A single-molecule magnet, 12-ac technology, used in inductor/transformer/magnet manufacturing, static memory, instruments, etc., can solve the problems of repeatability of fragile preparation methods, slender molecular crystals, etc., to increase quantum storage capacity, extend Service life, stable effect of preparation process

Inactive Publication Date: 2005-01-12
INST OF PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] In order to solve the technical problems of the above-mentioned Mn12-ac molecular crystals being fine and fragile, and the repeatability of the preparation method is poor, the object of the present invention is to provide a method for preparing single-molecule magnets (Mn 1-x Cr x )12-ac method; wherein, x represents the atomic percentage doping content of Cr, 0<x≤10%

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  • Method for preparing monomolecular magnet (Mn1-XCrX)12-ac
  • Method for preparing monomolecular magnet (Mn1-XCrX)12-ac

Examples

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Embodiment 1

[0014] Embodiment 1: (Mn 0.9 Cr 0.1 )12-ac

[0015] First, 6 g of Mn(CH 3 COO) 2 4H 2 O was dissolved in a reaction flask containing 70 ml of 60% acetic acid solution by volume, and then poured into 3.0 g of K 2 CrO 4 , and stirred for 0.5 hour to make it react completely. Transfer the reaction bottle to a water bath, set it on the reflux condenser, and turn on the stirrer to stir to make the water temperature in the tank uniform. Let the reaction bottle stand at room temperature for one hour, then raise the temperature to 318K at a rate of 12K / hour, and then raise the temperature to 328K at a rate of 10K / hour, keep the temperature at this temperature for 0.5 hours, then turn off the stirrer, and let it cool down to room temperature naturally , keep this state for 1440 hours. Finally, take it out and filter it, you can get many roots 1.5×1.5×5mm 3 of crystals. Such as figure 1 As shown, the measurement of its hysteresis loop by PPMS proves that the material has a ma...

Embodiment 2

[0016] Embodiment 2: (Mn 0.96 Cr 0.04 )12-ac

[0017] First, 6 g of Mn(CH 3 COO) 2 4H 2 O was dissolved in a reaction flask filled with 70 ml of 60% acetic acid solution by volume, and then poured into 2.2 g of K 2 CrO 4 and 0.4 g KMnO 4 , and stirred for 0.5 hour to make it react completely. Transfer the reaction bottle to a water bath, set it on the reflux condenser, and turn on the stirrer to stir to make the water temperature in the tank uniform. After the reaction bottle was allowed to stand at room temperature for one hour, the temperature was raised to 318K at a rate of 12K / hour, and then to 328K at a rate of 10K / hour. Keep it in this state for 1440 hours at room temperature. Finally, take it out and filter it, you can get many 2×2×5mm 3 of crystals. Such as figure 2 As shown, the measurement of its hysteresis loop by PPMS proves that the material has a magnetic macroscopic quantum effect, and compared with Mn12-ac molecular magnets, the tunneling probabili...

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Abstract

The method includes steps: (1) dissolving Mn(CH3COO)2.4H2O,K2Cr O4 and KMnO4 in acetum fully under room temp, and continuous agitating; (2) Displacing reaction bulb to water bath jar, standing at room temp, coming up by using water bath method; (3) heating up to 318-328 K and keeping it at constant temperature; (4) cooling down to room temp naturally and standing at the state. The invention raises volume of unimolecule (Mn1-xCrx) 12-ac, and quanta storage capacity of crystal greatly, tunneling probability is 1-7.5 times larger than Mnl2-ac molecular magnet.

Description

technical field [0001] The invention relates to a method for preparing a single-molecule magnet used in a storage device, in particular to a single-molecule magnet (Mn 1-x Cr x ) The preparation method of 12-ac. Background technique [0002] As microelectronics manufacturing continues to improve, the sophistication of a computer's central processing unit (CPU) silicon chip doubles every 18 months. According to this law, over the past 50 years since the advent of the computer, the computing speed has increased by about 1 billion times, and the line width of the CPU integrated circuit is now as small as 0.2 microns. By 2020 at the latest, the circuit line width will inevitably reach the physical limit of the size of a single molecule, which means that the development of traditional computers will come to an end. However, mankind's pursuit of faster and stronger information processing is never-ending. To enter the more microscopic atomic world, the development of quantum com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11C11/02H01F41/02
Inventor 何伦华王芳卫
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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