CN107202967A - Apply voltage measurement against the SQUID sample lever systems of magnetoelectric effect in situ - Google Patents
Apply voltage measurement against the SQUID sample lever systems of magnetoelectric effect in situ Download PDFInfo
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- CN107202967A CN107202967A CN201710344656.9A CN201710344656A CN107202967A CN 107202967 A CN107202967 A CN 107202967A CN 201710344656 A CN201710344656 A CN 201710344656A CN 107202967 A CN107202967 A CN 107202967A
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- sample
- magnetic
- specimen holder
- lever system
- connecting line
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- 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
- G01R33/035—Measuring direction or magnitude of magnetic fields or magnetic flux using superconductive devices
- G01R33/0354—SQUIDS
- G01R33/0358—SQUIDS coupling the flux to the SQUID
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- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
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Abstract
The invention provides a kind of apply to sample in-situ voltage and it is measured against the SQUID sample lever systems of magnetoelectric effect, including：External voltage source and computer；Accommodate the sample cavity of sample；The nonmagnetic specimen holder stretched into the sample cavity；It is connected with the specimen holder lower end and is fixed with the sample carrier of testing sample；It is wrapped in the connecting line on the specimen holder；Described connecting line one end is connected with the respective electrode on the sample, and the other end is connected with the external voltage source；Wherein, the sample carrier is nonmagnetic and uniform elongate strip.According to the present invention, it is possible to provide one kind is used for application voltage in situ, and can carry out the sample lever system that the inverse magnetoelectric effect of high accuracy is measured, and realizes the connection of sample and external voltage source, and then realizes the measurement of inverse magnetoelectric effect.
Description
Technical field
The present invention relates to the high-precision magnetic moment measurement technology on low temperature high-intensity magnetic field platform, more particularly in based superconductive quantum
Interferometer（SQUID）The magnetic measurement system of Detection Techniques（Magnetic Property Measurement System, referred to as
MPMS）Voltage is applied to sample in-situ in sample cavity, so as to realize the SQUID specimen holders that the inverse magnetoelectric effect of high accuracy is measured
System.
Background technology
Inverse magnetoelectric effect refers to that the ordered magnetic state of material can be changed by extra electric field, and then changes its magnetization
A kind of physical effect of intensity.With deepening continuously for the magnetoelectric effect research in magnetic electric compound material, people are to magnetoelectricity
The functional requirement of composite and related device quantitative measurement equipment also more and more higher.U.S. Quantum Design
The based superconductive quantum inteferometer of company's research and development（SQUID）The magnetic measurement system of Detection Techniques（Magnetic Property
Measurement System, abbreviation MPMS）It is universally acknowledged top magnetic performance measuring system, is surveyed with very high magnetic moment
Accuracy of measurement（Reach as high as 10-8emu）, it is possible to achieve to magnetic electric compound material magnetic performance（Magnetic signal is generally only 10-7~10-4emu）High-acruracy survey.
However, the existing measuring method of the measuring system is difficult to apply sample in-situ voltage, and then it is compound to obtain magnetoelectricity
The intensity of magnetization of material hampers people to the intrinsic physical mechanism of inverse magnetoelectric effect with the real-time change information of applied voltage
Further investigation.Based on MPMS magnetic measurement systems, alive technology is applied in development to sample in-situ, and then measures inverse magneto-electric coupled
Effect is for exploring novel magnetic power composite, studying magneto-electric coupled mechanism and developing the effector based on magnetoelectric effect
Part is particularly important.
The SQUID sample lever systems for magnetic measurement system have been disclosed in the prior art.For example, Fig. 4 is existing
SQUID specimen holder structural representations in MPMS magnetic measurement systems.As shown in figure 4, during measurement, the specimen holder gos deep into sample cavity 9 '
Interior, the end of its hypomere 4 ' is cylinder, for connecting the nonmagnetic plastic tube 5 ' equipped with sample 6 ', the lower end of plastic tube 5 ' nothing
The plastics small cylinder 7 ' of magnetic is clogged, to prevent testing sample 6 ' from being dropped to from plastic tube in sample cavity 9 '.The specimen holder is adopted
Sample is fixed with non-magnetic plastic tube 5 ', is not easy to by sample electrode position extraction wire, it is difficult to which voltage is applied to sample.
The subsidiary Survey Software of existing MPMS magnetic measurements system can not realize the control to external voltage source, and enter simultaneously
The measurement of row magnetic property.Accordingly, it would be desirable to write process of measurement again and existing specimen holder is redesigned, realize to sample
Original position applies voltage, and then measures inverse magnetoelectric effect.
Prior art literature：
Patent document：
Patent document 1：Chinese patent discloses CN103885010A；
Patent document 2：Chinese patent discloses CN206074785U.
The content of the invention
Problems to be solved by the invention：
In view of the problem of existing above, the technical problems to be solved by the invention are to provide a kind of be used for sample in-situ application
Voltage, and the sample lever system that the inverse magnetoelectric effect of high accuracy is measured can be carried out.
The means solved the problems, such as：
In order to solve the above-mentioned technical problem, the original position that is used for of the invention applies voltage measurement against the SQUID samples of magnetoelectric effect
Product lever system includes：External voltage source and computer；Accommodate the sample cavity of sample；The specimen holder stretched into the sample cavity；With
The specimen holder lower end connects and is fixed with the non-magnetic sample carrier of the sample；With the connection being wrapped on the specimen holder
Line；Described connecting line one end is connected with the respective electrode on the sample, and the other end is connected with the external voltage source.
Application voltage measurement in situ is used for against the SQUID sample lever systems of magnetoelectric effect according to the present invention, existing
Have and redesigned specimen holder on the basis of the SQUID specimen holders for such as MPMS magnetic measurements system, realize sample with it is outside
The connection of voltage source, and then realize the measurement of inverse magnetoelectric effect.
Furthermore, in the present invention, because sample carrier has nonmagnetic background, therefore can be before Magnetic Measurement precision is not influenceed
Realization application voltage measurement in situ is put against magnetoelectric effect.
Preferably, in the present invention, the connecting line is enamel covered wire, and is wrapped up by non-magnetic flexible insulated hose.From safety
Angle considers that connecting line is wrapped in insulation and non-magnetic flexible pipe, drastically increases security.In addition, can also prevent
Only connecting line and the sample cavity wall rub and reduce measurement noise.Also, in the present invention, non-magnetic polytetrafluoroethyl-ne can be used
The connecting line is fixed on specimen holder by alkene adhesive tape.
Preferably, in the present invention, the sample carrier is uniform non-magnetic elongated strip, and is made up of quartz material.Adopt
Existing nonmagnetic plastic tube is instead of as sample carrier with uniform non-magnetic elongated strip shaped quartz rod, had both been reduced background and has been made an uproar
Sound, facilitates the connection and installation of connecting line and the upper and lower electrode of sample, can also reduce the interference of background magnetic signal again.In addition,
In measurement process, specimen holder is constantly moved back and forth up and down, and elongated strip quartz specimen support is unlikely to deform in motion process.Cause
This, results in and more stablizes and reliable magnetic signal.
Preferably, in the present invention, the external voltage source is connected by GPIB coaxial cables with the computer.
Preferably, in the present invention, the sample is fixed on the centre of the sample carrier by the good material of electric conductivity
Position.
Preferably, in the present invention, the good material of the electric conductivity is nonmagnetic and can be in 2-400 K temperature ranges
Inside use.
Preferably, in the present invention, the connecting line is connected by quick union with external voltage source.
Preferably, in the present invention, the specimen holder is by non-magnetic carbon fiber or plastic production.
Preferably, in the present invention, thickness direction of the external voltage source along the sample applies voltage.
According to following embodiments and refer to the attached drawing, the above and other mesh of the present invention is better understood with
, feature and advantage.
Brief description of the drawings
Fig. 1 is to show to be used for application voltage measurement in situ against the SQUID specimen holders of magnetoelectric effect according to the present invention
The structural representation of system；
Fig. 2 is to show that measuring obtained magnetoelectricity in the case where not applying voltage with the SQUID samples lever system of the present invention answers
The magnetization M of condensation material with magnetic field H change curve；
Fig. 3 is to show to measure obtained magnetoelectricity in the case of applying voltage in the original location with the SQUID samples lever system of the present invention
The relative change of the intensity of magnetization of composite and inverse magneto-electric coupled coefficient with extra electric field change curve；
Fig. 4 is the structural representation for the sample lever system for showing existing MPMS magnetic measurements system；
Symbol description：
S sample lever systems；
B external voltage sources；
C computers；
1 specimen holder；
2 epimeres；
3 stage casings；
4 hypomeres；
6 samples；
8 Dewars；
9 sample cavities；
10 magnets；
11 sample carriers；
14th, 15 enamel covered wire（Connecting line）；
16 external connectors.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with specific embodiment, and reference
Accompanying drawing, further elaborates to the present invention.It should be noted that in accompanying drawing or specification description, it is similar or identical
Part all uses identical figure number.The implementation for not illustrating or describing in accompanying drawing, is ordinary skill people in the technical field
Form known to member.The embodiment described below with reference to accompanying drawing is exemplary, it is intended to for explaining the present invention, without
It is understood that as limitation of the present invention.In addition, herein can provide comprising special value parameter demonstration, it is to be understood that parameter without
Corresponding value need to be definitely equal to, but be similar to corresponding value in acceptable error margin or design constraint.
Hereinafter, with reference to accompanying drawing respectively to being used for application voltage measurement in situ against magnetoelectric effect according to this embodiment
SQUID sample lever systems（Hereinafter referred to as sample lever system）S each structure is described in detail.
Fig. 1 is the sample lever system S of present invention structural representation.Surveyed to carry out the inverse magnetoelectric effect of high accuracy
Amount, the sample lever system S of this embodiment, including：External voltage source B and computer C；Accommodate the sample cavity 9 of sample 6；Stretch into
Specimen holder 1 in the sample cavity 9；It is connected with the lower end of specimen holder 1 and is fixed with the non-magnetic sample carrier of the sample 6
11；Wrapped up by non-magnetic flexible insulated hose and be wrapped in the enamel covered wire 14 and 15 on the specimen holder 1；The enamel covered wire 14
It is connected with 15 one end with the respective electrode on the sample 6, the other end is connected with the external voltage source B.In addition, the sample
Support 11 in situ in the sample cavity can apply voltage measurement using uniform non-magnetic elongated strip shaped high-purity quartz bar
Inverse magnetoelectric effect.In addition, the Dewar 8 can provide low temperature environment for sample, the magnet 10 can provide for sample
Uniform magnetic field environment.
More specifically, in this embodiment, specimen holder 1 can be made by non-magnetic carbon fiber, and can have epimere 2, in
Section 3 and hypomere 4, total length is about 1.1 meters, but not limited to this, can specifically be adjusted according to sample cavity 9 and sample 6.
Reference picture 2 is understood, sample carrier 11 is connected with the hypomere 4 of specimen holder 1.In order to not influence Magnetic Measurement precision
Under the premise of realize and in situ apply voltage measurement against magnetoelectric effect, it is desirable to sample carrier 11 should have nonmagnetic background.
In this embodiment, sample carrier 11 can be long 200 mm, wide 5 mm, thick 0.6 mm high-purity（>99.99%）
Uniform strip quartz rod.Because quartz material is nonmagnetic material, therefore the sample carrier 11 is fixing the same of sample 6 well
When have the homogeneous background signal of a 200 mm length when ensure that inverse magnetoelectric effect measurement, so as to ensure inverse magneto-electric coupled
High-precision magnetic signal can be obtained during effect measurement, but sample carrier 11 is not limited to this embodiment.
In this embodiment, connecting line uses enamel covered wire 14 and 15, but not limited to this, specifically, the hypomere of specimen holder 1
4 enamel covered wire 14 and 15 is respectively connecting to the Top electrode and bottom electrode of testing sample 6, and specimen holder 1 is extended to along specimen holder 1
Epimere 2, through the aperture on the top of specimen holder 1（Omit diagram）, it is connected to by quick union 16 on external voltage source B.
In addition, in order to prevent in enamel covered wire 14 and 15 and sample cavity 9 wall friction and reduce measurement noise, can use without magnetic
Property flexible pipe parcel enamel covered wire 14 and 15, and the nonmagnetic flexible pipe is fixed on using non-magnetic polytetrafluoroethylene (PTFE) adhesive tape simultaneously
On specimen holder 1.And external voltage source B uses Keithley 6517B models, but not limited to this in this embodiment.
Specifically, the sample carrier 11 of quartz system is connected to the end of the hypomere 4 of specimen holder 1, thereon near centre position
Testing sample 6 is fixed with, by smearing the good material of electric conductivity so that the bottom electrode 13 and the paint on specimen holder 1 of sample 6
The lower end connection of copper-clad line 14, is connected enamel covered wire 15 with sample Top electrode 12 by smearing the good material of electric conductivity,
Then two enamel covered wires 14 and 15 on above-mentioned specimen holder 1 are extended out by the epimere 2 of specimen holder 1, passes through quick union
16 connect with external voltage source B, and external voltage source B is connected to computer C by GPIB coaxial cables, are transported in computer C
The measurement in situ for applying voltage, carrying out inverse magnetoelectric effect can be achieved in the process of measurement that row is write again.Above-mentioned electric conductivity
Can good material can be conductive silver paste, but not limited to this.
（Embodiment）
Hereinafter, it is discussed in detail and is surveyed according to the sample lever system S of the present invention in inverse magnetoelectric effect with reference to Fig. 1 and specific embodiment
Step in amount, the especially application in MPMS magnetic measurement systems.In the present embodiment, sample 6 is to be grown in 0.7Pb (Mg1/
3Nb2/3)O3-0.3PbTiO3（PMN-PT）The FeCoSiB ferromagnetic thin films that thickness on piezoelectric monocrystal is 100 nm, Fig. 2 is profit
With the magnetization M of this embodiment sample lever system S FeCoSiB films measured in the case of without voltage is applied with outer
Plus magnetic field H change curve, it can be seen that the magnetic signal precision measured using the sample lever system is higher.
First, the bottom electrode face of testing sample 6 is bonded to the centre position of the sample carrier 11 of quartz system with conductive silver paste, will
The upper and lower electrode of FeCoSiB/PMN-PT layered electromagnetic laminated films is connected with enamel covered wire 14,15 respectively, as shown in Figure 1.
Then, specimen holder 1 is loaded in the sample cavity 9 of MPMS magnetic measurement systems, the enamel covered wire 14 of the upper end of specimen holder 1,
15 are connected with quick union 16, and quick union 16 is connected with external voltage source Keithley 6517B, and is rinsed with high-purity helium
Sample cavity more than 9 times, such as three times, and vacuumize.
The MultiVu softwares carried with MPMS magnetic measurement systems carry out position scanning to sample and make center, so
Keithley 6517B are connected to computer C by GPIB coaxial cables 17 afterwards, opened for the measurement of inverse magnetoelectric effect
Program, starts measurement.
Fig. 3 carries out inverse for the sample lever system S of the embodiment of the present invention to FeCoSiB/PMN-PT magnetoelectric composite films sample
The relative change for the intensity of magnetization that magnetoelectric effect measurement is obtained（）And inverse magneto-electric coupled coefficient（α）With additional
The change curve of electric field.
Wherein, the abscissa of curve map is the electric-field intensity (unit is kV/cm) applied to sample in Fig. 3, and ordinate is
The obtained sample intensity of magnetization (unit is emu) is measured, that is, obtains change curve of the magnetic sample intensity with extra electric field, and then
The inverse magneto-electric coupled coefficient for obtaining sample can be calculated.
Wherein,Pass through below equation respectively with α（1）Calculating is obtained：
。
It follows that by comparing, the intensity of magnetization of FeCoSiB films under different magnetic field is relative to be changedAnd it is inverse
Magneto-electric coupled factor alpha with extra electric field change curve, it can be seen that can be realized using the sample lever system S of the present embodiment
The high-acruracy survey of inverse magnetoelectric effect.
More than, application voltage measurement in situ is used for against the SQUID samples of magnetoelectric effect to the present invention with reference to accompanying drawing
Lever system S is described in detail, and it applies voltage available in situ, and can carry out the inverse magnetoelectric effect survey of high accuracy
Amount.However, the above-mentioned definition to each element and method is not limited in various concrete structures, the shape chi mentioned in embodiment
Very little or mode, those of ordinary skill in the art can be modified or replace to it.
For example, carbon fiber samples bar can be replaced using nonmagnetic plastic sample bar.Conductive silver paste can be with other 2
K to 400 K temperature ranges there is viscosity, electric conductivity and non-magnetic material to replace.Quartz specimen support can use other nonmagnetic
And uniform elongate strip material is replaced.
In summary, on the basis of such as MPMS magnetic measurements system, electricity is applied using provided by the present invention for original position
The SQUID sample lever systems of the inverse magnetoelectric effect of pressure measurement, can be achieved to magnetoelectricity composite sample against magnetoelectric effect original
Position measurement, it is to avoid the error that ex situ measurement is brought, can more accurately understand the inverse magneto-electric coupled effect of magnetic electric compound material
Should, research and application problem encountered for magnetic electric compound material provide a solution.
Above-described specific implementation form has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, should be understood that the specific implementation form that the foregoing is only the present invention, be not limited to this hair
Bright, in the case where not departing from the objective of essential characteristic of the present invention, the present invention can be presented as the implementation in diversified forms, therefore the present invention
Form is to be illustrative rather than definitive thereof, and is defined by the claims rather than is limited by specification, Er Qieluo due to the scope of the present invention
All changes in the scope defined in claim, or the full scope of equivalents of its scope defined are understood to be included in right
In claim.
Claims (10)
1. a kind of be used for application voltage measurement in situ against the SQUID sample lever systems of magnetoelectric effect, it is characterised in that bag
Include：
External voltage source and computer；
Accommodate the sample cavity of sample；
The specimen holder stretched into the sample cavity；
The non-magnetic sample carrier of the sample is connected and is fixed with the lower end of the specimen holder；With
It is wrapped in the connecting line on the specimen holder；
Described connecting line one end is connected with the respective electrode on the sample, and the other end is connected with the external voltage source.
2. sample lever system according to claim 1, it is characterised in that the connecting line is enamel covered wire, and by without magnetic
Property flexible insulated hose parcel.
3. sample lever system according to claim 2, it is characterised in that use non-magnetic polytetrafluoroethylene (PTFE) adhesive tape by institute
Connecting line is stated to be fixed on specimen holder.
4. sample lever system according to claim 1, it is characterised in that the sample carrier is uniform non-magnetic elongate strip
Shape, and be made up of quartz material.
5. sample lever system according to claim 1, it is characterised in that the sample is fixed on institute by conductive material
State the centre position of sample carrier.
6. sample lever system according to claim 5, it is characterised in that the conductive material is nonmagnetic and can be in 2-
Used in 400 K temperature ranges.
7. sample lever system according to claim 1, it is characterised in that the specimen holder is by non-magnetic carbon fiber or modeling
Material makes.
8. sample lever system according to claim 1, it is characterised in that the connecting line passes through quick union and external electrical
Potential source is connected.
9. sample lever system according to claim 1, it is characterised in that the external voltage source passes through GPIB coaxial cables
It is connected with the computer.
10. sample lever system according to claim 1, it is characterised in that thickness of the external voltage source along the sample
Spend direction and apply voltage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710344656.9A CN107202967A (en) | 2017-05-16 | 2017-05-16 | Apply voltage measurement against the SQUID sample lever systems of magnetoelectric effect in situ |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710344656.9A CN107202967A (en) | 2017-05-16 | 2017-05-16 | Apply voltage measurement against the SQUID sample lever systems of magnetoelectric effect in situ |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108414955A (en) * | 2018-03-15 | 2018-08-17 | 中国科学技术大学 | A kind of survey magnetic specimen holder, magnetic measurement system and survey magnetism method |
| CN115248236A (en) * | 2021-12-31 | 2022-10-28 | 青岛大学 | In-situ magnetoelectric test device and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103885010A (en) * | 2014-04-16 | 2014-06-25 | 中国科学院半导体研究所 | SQUID sealing cavity system for magnetic and electrical property synchronous measurement |
| CN106449971A (en) * | 2016-10-27 | 2017-02-22 | 中国科学院物理研究所 | Magnetoelectric coupling heterogeneous structure as well as preparation method and application thereof |
| CN206074785U (en) * | 2016-09-26 | 2017-04-05 | 吉林大学 | The electrical testing probe of based superconductive quantum inteferometer SQUID VSM systems |
-
2017
- 2017-05-16 CN CN201710344656.9A patent/CN107202967A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103885010A (en) * | 2014-04-16 | 2014-06-25 | 中国科学院半导体研究所 | SQUID sealing cavity system for magnetic and electrical property synchronous measurement |
| CN206074785U (en) * | 2016-09-26 | 2017-04-05 | 吉林大学 | The electrical testing probe of based superconductive quantum inteferometer SQUID VSM systems |
| CN106449971A (en) * | 2016-10-27 | 2017-02-22 | 中国科学院物理研究所 | Magnetoelectric coupling heterogeneous structure as well as preparation method and application thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108414955A (en) * | 2018-03-15 | 2018-08-17 | 中国科学技术大学 | A kind of survey magnetic specimen holder, magnetic measurement system and survey magnetism method |
| CN115248236A (en) * | 2021-12-31 | 2022-10-28 | 青岛大学 | In-situ magnetoelectric test device and method |
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