CN107884728B - Method for measuring physical properties of magneto-optical medium film under low-temperature high-pressure condition - Google Patents
Method for measuring physical properties of magneto-optical medium film under low-temperature high-pressure condition Download PDFInfo
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- CN107884728B CN107884728B CN201711040833.0A CN201711040833A CN107884728B CN 107884728 B CN107884728 B CN 107884728B CN 201711040833 A CN201711040833 A CN 201711040833A CN 107884728 B CN107884728 B CN 107884728B
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000000704 physical effect Effects 0.000 title claims abstract description 10
- 239000013307 optical fiber Substances 0.000 claims abstract description 31
- 239000004809 Teflon Substances 0.000 claims abstract description 27
- 229920006362 Teflon® Polymers 0.000 claims abstract description 27
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 25
- 238000006073 displacement reaction Methods 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 239000010979 ruby Substances 0.000 claims abstract description 11
- 229910001750 ruby Inorganic materials 0.000 claims abstract description 11
- 241000218202 Coptis Species 0.000 claims abstract description 7
- 235000002991 Coptis groenlandica Nutrition 0.000 claims abstract description 7
- 230000005374 Kerr effect Effects 0.000 claims abstract description 7
- 230000005415 magnetization Effects 0.000 claims abstract description 7
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000009530 blood pressure measurement Methods 0.000 claims abstract description 4
- 239000000084 colloidal system Substances 0.000 claims abstract description 4
- 238000002795 fluorescence method Methods 0.000 claims abstract description 4
- 229910052709 silver Inorganic materials 0.000 claims abstract description 4
- 239000004332 silver Substances 0.000 claims abstract description 4
- 239000011521 glass Substances 0.000 claims description 25
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 18
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 18
- 239000010935 stainless steel Substances 0.000 claims description 16
- 229910001220 stainless steel Inorganic materials 0.000 claims description 16
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 15
- 229910052782 aluminium Inorganic materials 0.000 claims description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 11
- 239000004411 aluminium Substances 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 239000010949 copper Substances 0.000 claims description 9
- 229910003460 diamond Inorganic materials 0.000 claims description 9
- 239000010432 diamond Substances 0.000 claims description 9
- 229910052737 gold Inorganic materials 0.000 claims description 9
- 239000010931 gold Substances 0.000 claims description 9
- 238000012856 packing Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 7
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 7
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 7
- 239000003822 epoxy resin Substances 0.000 claims description 6
- 229920000647 polyepoxide Polymers 0.000 claims description 6
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical group [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 3
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000002474 experimental method Methods 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 7
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000012360 testing method Methods 0.000 abstract description 3
- 230000001678 irradiating effect Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 description 5
- 238000013467 fragmentation Methods 0.000 description 4
- 238000006062 fragmentation reaction Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000010287 polarization Effects 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 230000008033 biological extinction Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 238000002189 fluorescence spectrum Methods 0.000 description 2
- -1 manganese bismuth aluminum silicon Chemical compound 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009812 interlayer coupling reaction Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000001755 magnetron sputter deposition Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/032—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect
- G01R33/0325—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect using the Kerr effect
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention relates to a method for measuring physical properties of a magneto-optical medium film under the conditions of a high-pressure physical experiment and material physical property measurement, wherein a sample is placed in a Teflon ring, a ruby sheet is placed beside the sample, one end of a gold thread is connected with the sample by silver colloid, and a liquid pressure medium is continuously added into the Teflon ring; the pressing device applies pressure to the anvil, adjusts the displacement tube and the screw, so that the relative positions among the optical fiber, the graded index lens and the silicon carbide supporting table meet the optical fiber transmission requirement, and performs pressure measurement by using a ruby fluorescence method; dielectric constant of the test sample: connecting a current lead to a dielectric constant measuring instrument, and recording the dielectric constant of the sample under the pressure condition of each anvil; and (3) applying a magnetic field to the sample, irradiating the laser emitted by the laser on the surface of the sample after passing through the polarizer, and allowing the light reflected from the surface of the sample to enter the photoelectric detector after passing through the analyzer so as to measure the magneto-optical Kerr effect and obtain the magnetization state of the sample under different pressure conditions.
Description
Technical Field
The invention relates to the field of high-pressure physical experiment technology and material physical property measurement, in particular to a method for measuring physical properties of a magneto-optical medium film under a low-temperature high-pressure condition, which can reduce the fragmentation rate of a sample film and is suitable for extremely low temperature.
Background
The anvil is the only scientific experimental device capable of generating static pressure above million atmospheric pressure at present, and is not replaced in high-pressure scientific research, and the working principle of the anvil is that a pair of high-hardness materials with very small table tops (the diameter is generally in the order of tens of micrometers) are utilized to mechanically squeeze a sample to generate a high-pressure environment, a metal gasket with a sample hole machined in advance is placed between the squeezing surfaces formed by the two table tops, and the sample is placed in the sample hole. The pressure of the sample needs to be monitored in the experimental process, and the current common pressure testing method generally uses a ruby fluorescence spectrum method, so that a ruby and the sample are placed in a sample chamber of a top anvil together, and fluorescence emitted by the ruby is collected.
The magneto-optical kerr effect is widely used as an important experimental means of surface magnetism in research of magnetic order, magnetic anisotropy, interlayer coupling in a multilayer film, phase change behavior among magnetic ultrathin films and the like. Magneto-optical kerr method is an effective method for measuring material properties, especially film material properties. The basic device for measuring magneto-optical kerr effect comprises: a magnet, a laser, a polarizer, an analyzer, and a photodetector. The basic experimental method is as follows: the laser beam passes through the polarizer, then enters the sample surface as linearly polarized light, then reflects from the sample surface, passes through the analyzer and enters the photodetector. The polarization direction of the analyzer is offset from the extinction position by a small angle delta from the polarizer, and the reflected light, whether the plane of polarization of the reflected light is rotated clockwise or counterclockwise, is reflected in an increase in intensity as a function of light intensity. Whereas in the approximately extinction position, the light passing through the analyzer has a background intensity I. The light intensity increases in the same direction as the rotation direction of the polarization plane of the reflected light and delta, and decreases in the opposite direction. The direction of magnetization of the sample can thus be distinguished by a change in the light intensity. When the sample is placed in the magnetic field, when the external magnetic field changes the magnetization intensity of the sample, the polarization state of reflected light changes, the light intensity passing through the analyzer also changes, and the magnetization state of the sample can be estimated according to the change of the light intensity detected by the photoelectric detector. Various magneto-optical medium materials have been developed, including amorphous rare earth-transition metal alloy materials, amorphous manganese bismuth aluminum silicon alloy materials, amorphous manganese bismuth rare earth alloy materials, etc., which are usually deposited on a substrate by vacuum evaporation, magnetron sputtering, etc., and have a thickness of typically about several hundred nanometers, so that they are relatively fragile in high-voltage experiments.
The prior art has the defects that in the method for measuring the pressure by the fluorescence spectrum in the non-atmospheric environment or the low-temperature environment, an optical fiber is required to introduce light into a pressure chamber and couple the optical fiber with a sample pressure chamber so that the optical fiber can efficiently transmit and collect the light, which is difficult; in the prior art, larger diamond is generally used as a top anvil, tungsten carbide is used as a supporting table material, the diamond is expensive, and the tungsten carbide is magnetic and light-proof; in testing the dielectric properties of fragile film samples under high pressure conditions using a anvil, the anvil is typically composed of a carbide anvil of tungsten, a metal platen that acts as an electrode, and an electrically insulating gasket. The difficulty in the prior art is that the distance between the effective area and the electrode is variable under different pressure conditions, and in addition, the effective electrode area is difficult to estimate particularly due to the deformation of the gasket, and the method for measuring the physical properties of the magneto-optical medium film under the condition of low temperature and high pressure can solve the problem.
Disclosure of Invention
In order to solve the problems, the device comprises an improved optical fiber coupling structure, a light-transmitting silicon carbide supporting table and a parallel plate electrode made of high-strength conductive glass, and adopts liquid oil or organic alcohol pressure medium, so that the probability of sample film fragmentation is reduced; the electrode plate made of the conductive glass has high hardness and high conductivity, and can effectively prevent liquid pressure medium from leaking in high-pressure experiments; the optical fiber coupling method and the special oblique square screw thread structure adopted in the optical fiber jacket and anvil pressing device can minimize the loss of light transmitted between high-pressure areas of the anvil, and are suitable for extremely low temperature; the invention uses the silicon carbide supporting table, and saves the cost of the device on the premise of not reducing the maximum pressure range which can be achieved by the anvil.
The technical scheme adopted by the invention is as follows:
the device mainly comprises an optical fiber, a displacement tube, a screw, a sleeve, a graded index lens, a silicon carbide supporting table, an epoxy resin and diamond particle mixture, a PTFE film, a conductive glass electrode plate, a current lead, a tungsten carbide anvil, a stainless steel ring, an aluminum gasket, a Teflon ring, a sample, supporting particles, gold wires, copper wires, a magnet, a laser, a polarizer and a photoelectric detector, wherein the magnet is used for generating a magnetic field at the position of the sample, the tungsten carbide anvil comprises an upper anvil and a lower anvil, the center of the axis is provided with a through hole, the epoxy resin and diamond particle mixture is filled in the hole, the PTFE film and the conductive glass electrode plate are sequentially covered, the liquid pressure medium cannot leak out, the current lead passes through the hole and is connected with the conductive glass electrode plate, the silicon carbide supporting table is a trapezoid prism table, two sets of identical sleeves are connected to the side surfaces of the trapezoid prism table, the graded index lens is fixed in the sleeve and is close to the side surface of the silicon carbide supporting table in the experiment, the tail end of the optical fiber is positioned in front of the graded index lens through the screw and the displacement tube, the distance between the screw and the displacement tube can be changed through adjusting the displacement tube and the screw, the lower surface of the silicon carbide supporting table is connected with the upper anvil of the tungsten carbide anvil, the pressing device applies pressure to the tungsten carbide anvil through the silicon carbide supporting table, the pressing device has higher hardness and better conductivity than the metal electrode material and has higher light transmittance, can prevent liquid pressure medium from flowing out under high pressure, increases the measurement precision of the electrical experiment, the current lead is copper wire wrapped with a PFA tube, the diameter of a gold wire is 10 microns, copper wire diameter 25 microns. Threads are formed on the inner side surface of the sleeve and the outer side surface of the displacement tube, the threads are oblique square threads, and the movable structure of the pressing device for pressing the tungsten carbide anvil is also oblique square threads, so that the thermodynamic deformation of the optical fiber and the pressing device of the anvil is consistent in a low-temperature environment, and the optical path adjustment is more precise; the conductive glass electrode plate is made of indium tin oxide, the surface of the conductive glass electrode plate is covered with a silylene coating film, and the thickness of the conductive glass electrode plate is 100 microns; the sample is located Teflon ring center, teflon ring outer lane cover has the stainless steel ring, stainless steel ring outer lane cover has the aluminium packing ring, the aluminium packing ring comprises two parts about the identical, the diameter direction of stainless steel ring and Teflon ring all has radial thru hole, the copper line is arranged in between two parts about the aluminium packing ring, the gold thread passes the radial thru hole of stainless steel ring and Teflon ring, sample, other end connection copper line are connected to gold thread one end, the region has the support granule between Teflon ring and the sample, can play the effect of supporting the gold thread.
The method for measuring physical properties of the magneto-optical medium film under the low-temperature high-pressure condition comprises the following steps:
loosening the pressing device, placing the sample in a Teflon ring, placing a ruby sheet beside the sample, connecting one end of a gold thread with the sample by using silver colloid, and continuously adding a liquid pressure medium into the Teflon ring;
secondly, the pressing device applies pressure to the anvil, and simultaneously adjusts the displacement tube and the screw to ensure that the relative position between the optical fiber and the graded index lens and the silicon carbide supporting table meets the optical fiber transmission requirement, and the pressure measurement is carried out by using a ruby fluorescence method;
third, dielectric constant of the sample is measured: connecting the current leads to a dielectric constant measuring instrument, and recording the dielectric constant of the sample under the pressure condition of each anvil;
and fourthly, a magnetic field is applied to the sample, laser emitted by the laser irradiates the surface of the sample after passing through the polarizer, and light reflected from the surface of the sample enters the photoelectric detector after passing through the analyzer so as to measure the magneto-optical Kerr effect, and finally, the magnetization state of the sample under different pressure conditions is obtained.
The beneficial effects of the invention are as follows:
the device comprises an improved optical fiber coupling structure, a light-transmitting silicon carbide supporting table and parallel plate electrodes made of high-strength conductive glass, and adopts liquid oil or organic alcohol pressure media, so that the probability of sample film fragmentation is reduced; the electrode plate made of the conductive glass has high hardness and high conductivity, and can effectively prevent liquid pressure medium from leaking in high-pressure experiments; the optical fiber coupling method and the special oblique square thread structure adopted in the optical fiber jacket and anvil pressing device can enable light rays to be transmitted between high-pressure areas of the anvil, and are suitable for extremely low temperature; the invention uses the silicon carbide supporting table, and saves the cost of the device on the premise of not reducing the achievable maximum pressure range.
Drawings
The following is further described in connection with the figures of the present invention:
fig. 1 is a schematic diagram of the structure of the present invention.
In the figure, 1, optical fiber, 2, displacement tube, 3, screw, 4, sleeve, 5, graded index lens, 6, silicon carbide support table, 7, epoxy and diamond particle mixture, 8, PTFE film, 9, conductive glass electrode plate, 10, current lead, 11, tungsten carbide anvil, 12, stainless steel ring, 13, aluminum gasket, 14, teflon ring, 15, sample, 16, support particles, 17, gold wire, 18, copper wire.
Detailed Description
As shown in fig. 1, the structure of the invention is schematically shown, the structure mainly comprises an optical fiber (1), a displacement tube (2), a screw (3), a sleeve (4), a graded index lens (5), a silicon carbide supporting table (6), an epoxy resin and diamond particle mixture (7), a PTFE film (8), a conductive glass electrode plate (9), a current lead (10), a tungsten carbide top anvil (11), a stainless steel ring (12), an aluminum gasket (13), a Teflon ring (14), a sample (15), supporting particles (16), gold wires (17), copper wires (18), a magnet, a laser, a polarizer and a photoelectric detector, wherein the magnet is used for generating a magnetic field at the position of the sample, the tungsten carbide top anvil (11) comprises an upper top anvil and a lower top anvil, the center of the axis is provided with a penetrating hole, the hole is filled with the epoxy resin and diamond particle mixture (7), the PTFE film (8) and the conductive glass electrode plate (9) are sequentially covered, a liquid pressure medium under high pressure can not leak, the current lead (10) penetrates through the hole and is connected with the conductive glass (9), the silicon carbide supporting table (6) is a refractive index sleeve (4) is fixed on the two sides of the sleeve (4) and is close to the surface of the glass (4), the screw (3) and the displacement tube (2) are used for positioning the tail end of the optical fiber (1) in front of the graded index lens (5), the distance between the screw and the optical fiber can be changed by adjusting the displacement tube (2) and the screw (3), the lower surface of the silicon carbide supporting table (6) is connected with the upper anvil of the tungsten carbide anvil (11), the pressing device applies pressure to the tungsten carbide anvil (11) through the silicon carbide supporting table (6), the pressing device is higher than the metal electrode material in hardness and good in conductivity and high in light transmittance, liquid pressure medium can be prevented from flowing out under high pressure, the measurement precision of an electrical experiment is increased, the current lead (10) is a copper wire wrapped with a PFA tube, the diameter of a gold wire (17) is 10 microns, and the diameter of the copper wire (18) is 25 microns. The inner side surface of the sleeve (4) and the outer side surface of the displacement tube (2) are provided with threads, the threads are oblique square threads, and the movable structure of the pressing device for pressing the tungsten carbide anvil (11) also adopts oblique square threads, so that the thermodynamic deformation of the optical fiber and the pressing device of the anvil in a low-temperature environment is consistent, and the optical path adjustment is more precise; the conductive glass electrode plate (9) is made of indium tin oxide, the surface of the conductive glass electrode plate is covered with a silylene coating film, and the thickness of the conductive glass electrode plate (9) is 100 micrometers; sample (15) are located teflon ring (14) center, teflon ring (14) outer snare has stainless steel ring (12), stainless steel ring (12) outer lane cover has aluminium packing ring (13), aluminium packing ring (13) are by the upper and lower two parts of identical, the diameter direction of stainless steel ring (12) and teflon ring (14) all has radial thru hole, copper line (18) are arranged in between the upper and lower two parts of aluminium packing ring (13), gold line (17) pass the radial thru hole of stainless steel ring (12) and teflon ring (14), sample (15) are connected to gold line (17) one end, copper line (18) are connected to the other end, region has between teflon ring (14) and sample (15) and supports granule (16), can play the effect of supporting gold line (17).
The method for measuring physical properties of the magneto-optical medium film under the low-temperature high-pressure condition comprises the following steps:
firstly, loosening the pressing device, placing a sample (15) in a Teflon ring (14), placing a ruby sheet beside the sample (15), connecting one end of a gold thread (17) with the sample (15) by using silver colloid, and continuously adding a liquid pressure medium into the Teflon ring (14);
secondly, the pressing device applies pressure to the anvil, and simultaneously adjusts the displacement tube (2) and the screw (3) to ensure that the relative positions among the optical fiber (1), the graded index lens (5) and the silicon carbide supporting table (6) meet the optical fiber transmission requirement, and the pressure measurement is carried out by using a ruby fluorescence method;
third, dielectric constant of the sample is measured: connecting the current leads (10) to a dielectric constant measuring instrument, recording the dielectric constant of the sample (15) under the pressure of each anvil;
and fourthly, a magnetic field is applied to the sample, laser emitted by the laser irradiates the surface of the sample (15) after passing through the polarizer, and light reflected from the surface of the sample enters the photoelectric detector after passing through the analyzer so as to measure the magneto-optical Kerr effect, and finally the magnetization state of the sample under different pressure conditions is obtained.
The method of the invention enables the measurement of magneto-optical kerr effect on fragile magneto-optical medium film samples under high pressure and extremely low temperature conditions through special design. The invention adopts liquid oil or organic alcohol pressure medium, which reduces the probability of sample film fragmentation; the electrode plate made of the conductive glass with high hardness and high conductivity is adopted, so that the leakage of a liquid pressure medium in a high-voltage experiment is effectively prevented, and the accuracy of an electronic measurement experiment is improved; the optical fiber coupling method and the special oblique square screw thread structure adopted in the optical fiber jacket and anvil pressing device can reduce the transmission loss of light rays between high-pressure areas of the anvil, and are suitable for extremely low temperature; the invention uses the silicon carbide supporting table, and saves the cost of the device on the premise of not reducing the maximum pressure range which can be achieved by the anvil.
Claims (1)
1. The device mainly comprises an optical fiber (1), a displacement tube (2), a screw (3), a sleeve (4), a graded index lens (5), a silicon carbide supporting table (6), an epoxy resin and diamond particle mixture (7), a PTFE film (8), a conductive glass electrode plate (9), a current lead (10), a tungsten carbide top anvil (11), a stainless steel ring (12), an aluminum gasket (13), a Teflon ring (14), a sample (15), supporting particles (16), gold wires (17), copper wires (18), a magnet, a laser, a polarizer and a photoelectric detector, wherein the magnet is used for generating a magnetic field at the position of the sample, the tungsten carbide top anvil (11) comprises an upper top anvil and a lower top anvil, the center of the axis is provided with a penetrating hole, the epoxy resin and diamond particle mixture (7) is filled in the hole, the PTFE film (8) and the conductive glass electrode plate (9) are sequentially covered, the current lead (10) penetrates through the hole and is connected with the conductive glass electrode plate (9), the silicon carbide supporting table (6) is a trapezoid-shaped silicon carbide supporting table (4), the surface of the sleeve is fixed near the surface of the sleeve (4) at the same refractive index when the two sides of the silicon carbide supporting table (6) are connected with the sleeve, the tail end of the optical fiber (1) is positioned in front of the graded index lens (5) through the screw (3) and the displacement tube (2), the distance between the tail end of the optical fiber and the displacement tube can be changed by adjusting the displacement tube (2) and the screw (3), the lower surface of the silicon carbide supporting table (6) is connected with the upper anvil of the tungsten carbide anvil (11), the pressing device applies pressure to the tungsten carbide anvil (11) through the silicon carbide supporting table (6), the current lead (10) is a copper wire wrapped with a PFA tube, the diameter of a gold wire (17) is 10 microns, the diameter of a copper wire (18) is 25 microns, the inner side surface of the sleeve (4) and the outer side surface of the displacement tube (2) are both provided with threads, and the threads are oblique threads, so that the movable structure of the pressing device for pressing the tungsten carbide anvil (11) also adopts oblique threads, the thermodynamic deformation of the optical fiber and the pressing device of the anvil is consistent under a low-temperature environment, and the optical path adjustment is more accurate; the conductive glass electrode plate (9) is made of indium tin oxide, the surface of the conductive glass electrode plate is covered with a silylene coating film, and the thickness of the conductive glass electrode plate (9) is 100 micrometers; sample (15) is located Teflon ring (14) center, teflon ring (14) outer snare has stainless steel ring (12), stainless steel ring (12) outer lane cover has aluminium packing ring (13), aluminium packing ring (13) are by two upper and lower parts of identical, the diameter direction of stainless steel ring (12) and Teflon ring (14) all has radial thru hole, copper line (18) are arranged between the upper and lower two parts of aluminium packing ring (13), gold line (17) pass stainless steel ring (12) and Teflon ring (14) radial thru hole, sample (15) are connected to gold line (17) one end, copper line (18) are connected to the other end, area has between Teflon ring (14) and sample (15) and supports granule (16), can play the effect of supporting gold line (17),
the method is characterized in that:
the method for measuring physical properties of the magneto-optical medium film under the low-temperature high-pressure condition comprises the following steps:
firstly, loosening the pressing device, placing a sample (15) in a Teflon ring (14), placing a ruby sheet beside the sample (15), connecting one end of a gold thread (17) with the sample (15) by using silver colloid, and continuously adding a liquid pressure medium into the Teflon ring (14);
secondly, the pressing device applies pressure to the anvil, and simultaneously adjusts the displacement tube (2) and the screw (3) to ensure that the relative positions among the optical fiber (1), the graded index lens (5) and the silicon carbide supporting table (6) meet the optical fiber transmission requirement, and the pressure measurement is carried out by using a ruby fluorescence method;
third, dielectric constant of the sample is measured: connecting the current leads (10) to a dielectric constant measuring instrument, recording the dielectric constant of the sample (15) under the pressure of each anvil;
and fourthly, a magnetic field is applied to the sample, laser emitted by the laser irradiates the surface of the sample (15) after passing through the polarizer, and light reflected from the surface of the sample enters the photoelectric detector after passing through the analyzer so as to measure the magneto-optical Kerr effect, and finally the magnetization state of the sample under different pressure conditions is obtained.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711040833.0A CN107884728B (en) | 2017-10-20 | 2017-10-20 | Method for measuring physical properties of magneto-optical medium film under low-temperature high-pressure condition |
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Citations (9)
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| US6543295B2 (en) * | 2000-04-21 | 2003-04-08 | Carnegie Institution Of Washington | High pressure anvil and optical window |
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| DE3711326A1 (en) * | 1987-04-03 | 1988-10-20 | Standard Elektrik Lorenz Ag | Sensor with Kerr effect |
| US5994898A (en) * | 1993-03-05 | 1999-11-30 | Northeastern University | Apparatus and method for measuring instantaneous power using a magneto-optic Kerr effect sensor |
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| CN101900762A (en) * | 2010-07-19 | 2010-12-01 | 吉林大学 | Measuring method of magnetic resistivity of substance under the condition of high voltage |
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