WO2017018953A1 - Multi functional sample holder and high resolution detection system for magneto optical kerr effect measurements - Google Patents

Multi functional sample holder and high resolution detection system for magneto optical kerr effect measurements Download PDF

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Publication number
WO2017018953A1
WO2017018953A1 PCT/TR2015/050295 TR2015050295W WO2017018953A1 WO 2017018953 A1 WO2017018953 A1 WO 2017018953A1 TR 2015050295 W TR2015050295 W TR 2015050295W WO 2017018953 A1 WO2017018953 A1 WO 2017018953A1
Authority
WO
WIPO (PCT)
Prior art keywords
sample
sample holder
measured
magnetization
plane
Prior art date
Application number
PCT/TR2015/050295
Other languages
English (en)
French (fr)
Inventor
Numan AKDOGAN
Erdem DEMIRCI
Original Assignee
Gebze Teknik Universitesi
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gebze Teknik Universitesi filed Critical Gebze Teknik Universitesi
Publication of WO2017018953A1 publication Critical patent/WO2017018953A1/en

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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

Definitions

  • the invention is related to a magneto optical Kerr effect (MOKE) system used in analyzing nano structured magnetic films in information storage technologies.
  • MOKE magneto optical Kerr effect
  • the present invention is related to a magneto optical Kerr effect (MOKE) system which provides some additional advantages, eliminates all disadvantages and meets all said requirements mentioned above.
  • the aim of the invention when the known state of the art is taken into consideration, is to enable the measurement of magnetization curves perpendicular to the sample plane and at the sample plane of ferromagnetic materials and their angular magnetization characteristics via the developed magneto optical Kerr effect (MOKE) system, using a single sample holder.
  • Another aim of the invention is to increase the ratio of signal/noise and in turn to increase measurement precision by using a filtering system formed of a photo elastic modulator (PEM), amplifier, and lock-in amplifier via the developed magneto optical Kerr effect (MOKE) system.
  • PEM photo elastic modulator
  • MOKE developed magneto optical Kerr effect
  • Figure- 1 Schematic view of the multi functional sample holder and high resolution detection system for MOKE measurements.
  • Figure-2 The view of the longitudinal MOKE geometry where magnetization in the sample plane is measured.
  • Figure-4 View of the multi functional sample holder system.
  • Control computer having GPIB, RS232 and USB ports
  • the multi functional sample holder (6) which is shaped like a semi cylinder and the high resolution detection system for the MOKE measurements subject to the invention are being described as an illustration and such that it shall not be construed as limitation, only in order to ensure that the subject of the invention is understood more clearly.
  • the multi functional sample holder (6) and the high resolution detection system for the MOKE measurements shown in Figure 1, is used together with an electromagnet (3) and a laser (1).
  • the sample holder (6) is characterized in that it is shaped like a semi cylinder which enables magnetization measurements at the sample (18) plane to be measured and magnetization measurements perpendicular to the sample (18) plane that is to be measured.
  • Approximately 1 Tesla magnetic field can be applied to the sample by the C-framed electromagnet (3) designed for optic measurements.
  • the homogenous magnetic field formed between the electromagnet (3) poles is measured via a digital Teslameter (17).
  • a perpendicular polarizer (S-Polarizer) (2) having S- polarization has been placed on beamline in order to polarize the laser beam.
  • the polarized beam that is reflected from the sample (18) to be measured initially passes through the alignment pinhole (9) used for alignment and then is marked with a photo elastic modulator (PEM) (10) in order prevent the contribution of the beams that have different intensity in the medium.
  • PEM photo elastic modulator
  • the laser beam that is marked by said photo elastic modulator (PEM) (10) reaches the active region of the photodiode detector (13) after passing through the parallel polarizer (12) having P-polarization. If the sample (18) measured is magnetic the polarization of the laser beam emitted onto the sample changes and the signal at the photo diode detector (13) is measured.
  • An amplifier (14) having a range of 100mA - 2nA is used in order to increase the intensity of the beam received by the detector.
  • the signal received from the amplifier (14) and the marking information received from the photo elastic modulator (PEM) control unit (11) is processed by the lock-in amplifier (15) and is then transferred to the control computer (having GPIB, RS232 and USB ports) (19).
  • the connections between the photo diode detector (13) and the amplifier (14), the amplifier (14) and the lock-in amplifier (15), the photo elastic modulator control unit (11) and the lock-in amplifier (15) are provided by BNC cables.
  • the data obtained from the lock-in amplifier (15) and the magnetic field value read from the digital Teslameter (17) is entered into the control computer (having GPIB, RS232 and USB ports) (19) simultaneously and the information is drawn as a graphic image.
  • the MOKE measurement system can convert the measurement from the measurement geometry (Longitudinal-MOKE) of the magnetization in sample plane shown in Figure 2, to the measurement geometry (Polar-MOKE ) of the magnetization perpendicular to the sample plane in Figure 3, by means of a Triaxial driving unit (20) and a non magnetic mirror (5).
  • Said Triaxial driving unit (20) is characterized in that it can move in three axes (forward-backward, up-down, right-left) compliant with the sample holder (6) and the 360 degree sample rotating stepper motor (7).
  • Magnetization measurements of sample rotation depending on 0.01 degree angles between 0-360 degrees can be carried out by using a 360 degree sample rotating stepper motor (7) in the longitudinal MOKE geometry shown in Figure 2.
  • a 360 degree sample rotating stepper motor (7) in the longitudinal MOKE geometry shown in Figure 2.
  • the control computer having GPIB, RS232 and USB ports (19) in the multi functional sample holder (6) and high resolution detection system for MOKE measurements
  • a stepper motor control unit (8), and an electro-magnet power supply (4) in order to provide power to the electromagnet (3) has been supplied.
  • a magnetic field sensor (16) is provided which is connected to the sample (18) that is to be measured.
  • the sample holder (6) and the high resolution detection system which can be used in compliance with both geometries shown in Figure 4, for the MOKE measurements whose components and operation principles have been described in detail above, can be used in the research laboratories of universities, in R&D centres and in industrial is institutions that develop products in the magnetic information storage field.
  • the device is a multi functional device for the magnetic analysis of information storage devices having features such as performing high precision measurement in thin films, having transition between measurement geometries, and a multi functional sample holder (6) system.
  • the high resolution detection system used in order to increase the precision of said MOKE measurements comprises a photo elastic modulator (10) which marks the polarized laser beam reflected from the sample (18) to be measured, a perpendicular polarizer (S-Polarizer) (2) and a parallel polarizer (P-Polarizer) (12) placed in the path of the beam before and following the sample (18) to be measured, a photo diode detector (13) which measures the intensity of the beam, an amplifier (14) which increases the signal measured by the detector (13) and a lock in amplifier (15) which reduces the effect of other light sources in the medium.
  • a photo elastic modulator 10 which marks the polarized laser beam reflected from the sample (18) to be measured
  • S-Polarizer perpendicular polarizer
  • P-Polarizer parallel polarizer

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Magnetic Variables (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
PCT/TR2015/050295 2015-07-27 2015-12-30 Multi functional sample holder and high resolution detection system for magneto optical kerr effect measurements WO2017018953A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR2015/09249 2015-07-27
TR2015/09249A TR201509249A2 (tr) 2015-07-27 2015-07-27 Manyeto-opti̇k kerr etki̇si̇ ölçümleri̇ i̇çi̇n çok fonksi̇yonlu örnek tutucusu ve yüksek çözünürlüklü deteksi̇yon si̇stemi̇

Publications (1)

Publication Number Publication Date
WO2017018953A1 true WO2017018953A1 (en) 2017-02-02

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Family Applications (1)

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PCT/TR2015/050295 WO2017018953A1 (en) 2015-07-27 2015-12-30 Multi functional sample holder and high resolution detection system for magneto optical kerr effect measurements

Country Status (2)

Country Link
TR (1) TR201509249A2 (tr)
WO (1) WO2017018953A1 (tr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111077114A (zh) * 2018-10-22 2020-04-28 三星电子株式会社 磁性质测量系统和方法和使用其制造磁存储器件的方法
KR102263648B1 (ko) * 2019-12-19 2021-06-10 울산과학기술원 자기장 커 효과 측정 장치
US11906605B1 (en) 2020-10-30 2024-02-20 The United States Of America, As Represented By The Secretary Of The Navy Apparatus, systems, and methods for measurement using magneto-optical Kerr effect

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
TRUDEL SIMON ET AL: "Note: Probing quadratic magneto-optical Kerr effects with a dual-beam system", REVIEW OF SCIENTIFIC INSTRUMENTS, AIP, MELVILLE, NY, US, vol. 81, no. 2, 12 February 2010 (2010-02-12), pages 26105 - 26105, XP012134678, ISSN: 0034-6748, DOI: 10.1063/1.3276715 *
WANG RAN ET AL: "Measuring magnetic anisotropy with a rotatable ac electromagnet", MEASUREMENT, vol. 79, 4 November 2015 (2015-11-04), pages 15 - 19, XP029340918, ISSN: 0263-2241, DOI: 10.1016/J.MEASUREMENT.2015.10.032 *
WILL I G ET AL: "Development of anmagnetoelastic magneto-optical Kerr effect magnetometer", REVIEW OF SCIENTIFIC INSTRUMENTS, AIP, MELVILLE, NY, US, vol. 83, no. 6, 1 June 2012 (2012-06-01), pages 64707 - 64707, XP012162402, ISSN: 0034-6748, [retrieved on 20120619], DOI: 10.1063/1.4729572 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111077114A (zh) * 2018-10-22 2020-04-28 三星电子株式会社 磁性质测量系统和方法和使用其制造磁存储器件的方法
KR102263648B1 (ko) * 2019-12-19 2021-06-10 울산과학기술원 자기장 커 효과 측정 장치
US11906605B1 (en) 2020-10-30 2024-02-20 The United States Of America, As Represented By The Secretary Of The Navy Apparatus, systems, and methods for measurement using magneto-optical Kerr effect

Also Published As

Publication number Publication date
TR201509249A2 (tr) 2016-10-21

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