Table of Contents
Advertisement
Quick Links
Methods and apparatus disclosed and described herein have been developed solely on company funds of
Lake Shore Cryotronics, Inc. No government or other contractual support or relationship whatsoever has existed
which in any way affects or mitigates proprietary rights of Lake Shore Cryotronics, Inc. in these developments.
Methods and apparatus disclosed herein may be subject to U.S. Patents existing or applied for.
Lake Shore Cryotronics, Inc. reserves the right to add, improve, modify, or withdraw functions, design modifications,
or products at any time without notice. Lake Shore shall not be liable for errors contained herein or for incidental or
consequential damages in connection with furnishing, performance, or use of this material.
Rev. 1.0
Manual Addendum to the
Magnetoresistance
Insert Probe Option
Westerville, Ohio 43082-8888 USA
P/N 119-605
7400 Series VSM
Model
74046
Lake Shore Cryotronics, Inc.
575 McCorkle Blvd.
sales@lakeshore.com
service@lakeshore.com
www.lakeshore.com
Fax: (614) 891-1392
Telephone: (614) 891-2243
15 July 2010
|
www.lakeshore.com
Advertisement
Table of Contents
Related Manuals for Lakeshore 74046
Summary of Contents for Lakeshore 74046
- Page 1 Manual Addendum to the 7400 Series VSM Model 74046 Magnetoresistance Insert Probe Option Lake Shore Cryotronics, Inc. 575 McCorkle Blvd. Westerville, Ohio 43082-8888 USA sales@lakeshore.com service@lakeshore.com www.lakeshore.com Fax: (614) 891-1392 Telephone: (614) 891-2243 Methods and apparatus disclosed and described herein have been developed solely on company funds of Lake Shore Cryotronics, Inc.
- Page 2 Copyright 2010 Lake Shore Cryotronics, Inc. All rights reserved. No portion of this manual addendum may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the express written permission of Lake Shore. Model 74046 Magnetoresistance Insert Probe Option...
-
Page 3: Table Of Contents
1.0 Introduction 1.1 Model 74046 Magnetoresistance Insert Option Part List ......1 1.2 Specifications ............... . . 1 2.0 Software... - Page 4 Model 74046 Magnetoresistance Insert Option 4.0 MR 4.1 Sample Size and Pin Placement ........... . . 29 4.1.1 Correcting a Skew in the MR Curve .
-
Page 5: Introduction
7400 Series VSM Hardware and Software Manual Addendum 1.0 Introduction The Model 74046 magnetoresistance insert probe option for the 7400 Series VSM provides a method to measure magnetoresistance (MR) effects with a small sample geometry. Magnetoresistance can be measured both at room temperature and at variable temperatures when placed within the sample bore of a Lake Shore VSM temperature appliance such as a Model 74034 oven or Model 74018 cryostat. -
Page 6: Software Installation
Model 74046 Magnetoresistance Insert Probe Option 2.0 Software Follow these instructions to install the software. Installation 1. Turn on the PC and rack console. 2. Insert the MR disk into the CD Rom drive and run the software installation file, “LakeShoreMRV2.X Setup.EXE”. -
Page 7: Page Two
A/D converter before each measurement is made, minimizing drift on long measurements. Use filter: select this setting to use the filter built into the KI 2400 to reduce noise in voltage readings. This may reduce the bandwidth of the voltage measurements. www.lakeshore.com... -
Page 8: Page Three
Model 74046 Magnetoresistance Insert Probe Option 2.1.3 Page Three FIGURE 3 Page three Switching: leave at default VSM head: select the VSM head drive model number Auto rotation option: select this option if present Communication: Select COM 1 Logging: click to clear this setting... -
Page 9: Page Four
2.1.4 Page Four FIGURE 4 Page four Select your electromagnet model and polecap diameter 2.1.5 Page Five FIGURE 5 Page five Select your magnet power supply model www.lakeshore.com... -
Page 10: Page Six
Model 74046 Magnetoresistance Insert Probe Option 2.1.6 Page Six FIGURE 6 Page six Field control setup parameters: select Accept Defaults 2.1.7 Page Eight FIGURE 7 Page eight Temperature option: select No Temperature Option Model 74046 MR Insert Probe Option... -
Page 11: Install Software Key
PC with the software key installed. The software key is a small, light green USB device, labeled # 672-676, SOFTWARE KEY. Place it into an available USB slot in the PC. This software key will remain attached to the PC. It is reqired to run an experiment file with the MR software. www.lakeshore.com... -
Page 12: Mr Operation
Model 74046 Magnetoresistance Insert Probe Option 3.0 MR Operation This section includes basic procedures for daily operation of the MR insert. 3.1 Switching 1. From the VSM software, select Current mode and ramp the field to zero. 2. Exit the VSM software. -
Page 13: Installing The Mr Insert
Finger tighten the white nylon screw to secure the insert in the holder; do not over tighten as this can damage the insert tube (FIGURE 10). FIGURE 10 Left: Place the MR insert into the holder; Right: Finger tighten the white nylon screw www.lakeshore.com... -
Page 14: Attach The Cables
Model 74046 Magnetoresistance Insert Probe Option 3.3.1 Attach the Cables 1. Locate the MR console cable. It is the grey cable with an 8-pin circular bayonet connector that exits from the rear of the VSM console, where the other end is permanently attached to the blue MR adaptor box. -
Page 15: Install The Mr Insert Probe Option
VSM head, and attach it as you would a sample tail (FIGURE 13). FIGURE 13 MR insert probe option attached to VSM If you are using a temperature option, slide the VSM head forward with the coupling nut raised to prevent interference between the MR insert and VSM head. www.lakeshore.com... -
Page 16: Mr Software Operation
Model 74046 Magnetoresistance Insert Probe Option 3.4 MR Software The MR Software uses a traditional Windows™ interface, incorporating a main menu, toolbar, and a status bar. You may create files, save them, and open them in the same Operation manner as other Windows™ software. At the bottom o f the main software screen is a status bar. -
Page 17: Creating A Measurement Setup File (*.Mrm)
2. This dialog box will prompt you to enter the desired temperature. FIGURE 16 Go to Temperature dialog box 3. Enter the setting and click OK. Note the units used. 4. The go to temperature control step is added to the current measurement setup. www.lakeshore.com... -
Page 18: Go To Field
Model 74046 Magnetoresistance Insert Probe Option 3.4.3.1.3 Go to Field Go to field executes a field change according to the current field control parameters (P,I ramp-rate) as defined in the configuration utility. 1. From the Main menu, select Measurement, Add Measurement, Go to Field. -
Page 19: Experiment Step: Contact Formation
D Number of cycles: enter the number of times that the voltage will be cycled on and then off. 3. Enter the above parameters and click OK. 4. The contact formation experiment is added to the measurement setup. www.lakeshore.com... -
Page 20: Experiment Step: Iv Contact Checking Measurement
Model 74046 Magnetoresistance Insert Probe Option 3.4.3.3 Experiment Step: IV Contact Checking Measurement IV contact checking applies a series of currents across a specific probe point contact pair, measures the resulting voltages across the pair, and plots the data as a V vs. I plot. -
Page 21: Variable Field Measurement-Field Profile Dialog Box
If a custom field sweep type is chosen, the Field Segments dialog box will appear. The user may build or import a series of applied field step sizes (point by point mode) or ramp rates (continuous mode) to create a truly custom field sweep. FIGURE 22 Field segments dialog box www.lakeshore.com... - Page 22 Model 74046 Magnetoresistance Insert Probe Option Data is grouped in segments which include a from and to value, along with a field step size (point by point mode) or ramp rate (continuous mode). This list describes the functions provided for this:...
-
Page 23: Measurement And Analysis Setup
1/50 s (50 Hz), depending on local AC line frequency. The time period sets the integration time of the A/D converter when determining the measurement of R. A higher NPLC takes longer, but achieves a lower noise measurement. A low NPLC does the opposite. www.lakeshore.com... - Page 24 Model 74046 Magnetoresistance Insert Probe Option Advanced: the Advanced dialog box allows you to turn on a filter type Repeating: takes x points and averages them to make a reading. This process repeats for x new points. Moving: takes x/2 points before the sample and x/2 points after a sample of interest, then averages the data to give the value of the middle point.
-
Page 25: Experiment Step: R Vs.temperature Measurement
Point by point with linear spacing: in this mode, the system will ramp to the next linear temperature increment, settle and then acquire R data. This process will then repeat until the ending temperature is reached. Temperature step box: enter a temperature increment. www.lakeshore.com... -
Page 26: Experiment Step: R Vs. Angle
Model 74046 Magnetoresistance Insert Probe Option Point by point with 1/T spacing: in this mode, the system will determine a 1/T spacing within the specified temperature range and ramp to that sequence of temperatures. At each temperature, the system will ramp to the temperature, settle, and then acquire R data. -
Page 27: Executing A Measurement
1. Click the Open Results icon or from the Main menu select File, Open From a Measurement Measurement Result. Results File 2. Open an existing results file. The measurement setup, accumulated tabular data, and graphical representations of that data are displayed on the screen. www.lakeshore.com... - Page 28 Model 74046 Magnetoresistance Insert Probe Option FIGURE 26 Results file 3. There are three tabular/graphical display methods; you may change modes by selecting the appropriate tab above the tabular data section on the main screen. R vs field: once R is acquired and averaged, it is plotted against field. R is plotted on the Y axis.
-
Page 29: Using Manual Modes
5. To stop the ramping of the field, click Stop Ramp. 6. To shut off the field controller and return to zero current output, click Shutdown Field. This will usually leave some remanent field in the electromagnet airgap (a non-zero field remains in the airgap). www.lakeshore.com... -
Page 30: Manual Temperature Control
Model 74046 Magnetoresistance Insert Probe Option 3.4.6.2 Manual Temperature Control 1. Select the Temperature icon or from the Main menu select Measurement, Manual, Temperature Control. 2. This dialog box controls the manual temperature operation. FIGURE 28 Manual Temperature Control dialog box Though this dialog box looks complex, it is simple to operate. -
Page 31: Operating A Temperature Device
File menu on the first Temperature Options page of the utility. 2. The temperature device must now be physically setup according to its own instructions, as if it were to be run on a VSM with these guidelines: www.lakeshore.com... - Page 32 Model 74046 Magnetoresistance Insert Probe Option a. The position of the temperature option is not as critical for the MR as it is in a VSM measurement. Since we are not trying to saddle a sample about a set of sensing coils, there is no need to precisely locate the temperature option.
-
Page 33: Mr Measurements
4.0 MR Resistance measurement is made in the 74046 MR insert probe option via an in-line four point probe. The in-line four point probe performs a standard 4-wire resistance Measurements measurement where current is sourced from the leftmost pin to the rightmost pin, with voltage sensed on the inner two pins, where R=V/I. -
Page 34: Re-Seating Probe Points With The Sample
Model 74046 Magnetoresistance Insert Probe Option 4.1.1.2 Re-Seating Probe Points with the Sample 1. If you are still sourcing current to the sample in the Manual Resistance dialog box, click Stop. 2. Carefully lift and release both of the probe's lever arms to re-seat the probe points against the sample. -
Page 35: Post-Processing Data Results
See section 5.1 and section 5.2 for pin removal and replacement. Sample contacts may exhibit various junction effects, such as diode drops, when the W pins contact the dissimilar material of the sample. Current reversal can often help in distinguishing these effects. www.lakeshore.com... - Page 36 Model 74046 Magnetoresistance Insert Probe Option An IV measurement should be made to ensure you have ohmic sample contacts. Some users coat the tungsten pins with various materials to both extend the life of the pin, and to eliminate such junction effects. The holes of the ceramic pin guide are small, however, and will restrict the travel of a coated pin.
-
Page 37: Maintenance
6. Using a 5/bg in hex key wrench, remove the four 6-32 button head cap screws from the bottom of the insert to detach the tube from the MR body (FIGURE 33). FIGURE 33 Remove the welded tube from the MR body 7. De-solder the probe pins from the PCB and remove. www.lakeshore.com... -
Page 38: Replace Internal Parts
Model 74046 Magnetoresistance Insert Probe Option 5.2 Replace This section provides procedures for replacing the ceramic holder and pin guide, and soldering probe pins to the new PCB. Internal Parts 5.2.1 Replace Ceramic This procedure will take 24 hr to allow for the adhesive to dry. -
Page 39: Solder The Probe Pins To The Pcb
Prep and solder the blunt end of the pins to the PCB with rosin cored solder. Do not allow the solder to short the pins together. Remove excess flux. 5. Disassemble the PCB and welded tube from the spacer. www.lakeshore.com... -
Page 40: Reassemble The Mr Insert Probe
Model 74046 Magnetoresistance Insert Probe Option 5.3 Reassemble This section provides procedures to reassemble the MR internal assembly and to attach the top cover to the body. the MR Insert Probe 5.3.1 Reassemble the 1. Using the four 6-32 screws, attach the welded tube to the MR body. Position the MR Internal Assembly body’s single tapped hole to your left and the raised portion of the tube’s ceramic... -
Page 41: Reassemble The Top Cover To The Body
3. Route cable wires through the slit on the left side of the MR body. 4. Secure the top cover with four 6-32 screws. 5. Test the motion: pull both levers at the same time on the assembled MR body up and then down. The motion should be smooth with no binding. www.lakeshore.com... - Page 42 Model 74046 Magnetoresistance Insert Probe Option Model 74046 MR Insert Probe Option...
Need help?
Do you have a question about the 74046 and is the answer not in the manual?
Questions and answers