Loading…

Effect of the thickness reduction on the structural, surface and magnetic properties of α-Fe2O3 thin films

Hematite (α-Fe2O3) polycrystalline thin films of different thicknesses were produced by thermal oxidation in air atmosphere from Fe metallic thin-films deposited by radio frequency (RF) sputtering technique. X-ray diffraction (XRD) patterns confirm the formation of hematite phase in all samples and...

Full description

Saved in:
Bibliographic Details
Published in:Thin solid films 2016-05, Vol.607, p.50-54
Main Authors: Aragón, Fermin F.H., Ardisson, José D., Aquino, Juan C.R., Gonzalez, Ismael, Macedo, Waldemar A.A., Coaquira, José A.H., Mantilla, John, da Silva, Sebastião W., Morais, Paulo C.
Format: Article
Language:English
Subjects:
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
cited_by cdi_FETCH-LOGICAL-c330t-4e45749726a21467fb1f3d15ba279b49c3fc9dbfee014a618566a824133ce24b3
cites cdi_FETCH-LOGICAL-c330t-4e45749726a21467fb1f3d15ba279b49c3fc9dbfee014a618566a824133ce24b3
container_end_page 54
container_issue
container_start_page 50
container_title Thin solid films
container_volume 607
creator Aragón, Fermin F.H.
Ardisson, José D.
Aquino, Juan C.R.
Gonzalez, Ismael
Macedo, Waldemar A.A.
Coaquira, José A.H.
Mantilla, John
da Silva, Sebastião W.
Morais, Paulo C.
description Hematite (α-Fe2O3) polycrystalline thin films of different thicknesses were produced by thermal oxidation in air atmosphere from Fe metallic thin-films deposited by radio frequency (RF) sputtering technique. X-ray diffraction (XRD) patterns confirm the formation of hematite phase in all samples and indicate that the mean grain size decreases as the film thickness becomes thinner. Conversion electron Mössbauer spectroscopy (CEMS) spectra at room temperature show magnetic splitting (six line patterns). It is determined that the resonance peaks become broader and asymmetric as the film thickness decreases. This finding was associated with the structural disorder introduced by the thickness reduction. Magnetization as a function of the magnetic field curve obtained at 300K shows the presence of a weak-ferromagnetic contribution, which was assigned to the large density of decompensated spins at the films surface. From the magnetization vs. temperature curves it has been determined that the Morin transition temperature (TM) is shifted from ~240K to ~196K, meanwhile it becomes more broadened as the film thickness decreases. X-ray photoelectron spectroscopy (XPS) measurements show the presence of Fe2+ ions coexisting with Fe3+ ions whose population increases as the film becomes thinner. The density of chemisorbed oxygen increases as the film thickness is reduced in agreement with the results obtained from the other measurements in this work. •Hematite thin films with different thickness were deposited by RF sputtering technique.•X-ray diffraction patterns confirm the formation of hematite phase in all samples.•Hysteresis curve at 300K shows the presence of a weak-ferromagnetic phase.•XPS show the presence of Fe2+ ions coexisting with Fe3+ ions.
doi_str_mv 10.1016/j.tsf.2016.03.052
format article
fullrecord <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_miscellaneous_1816016470</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><els_id>S0040609016300098</els_id><sourcerecordid>1816016470</sourcerecordid><originalsourceid>FETCH-LOGICAL-c330t-4e45749726a21467fb1f3d15ba279b49c3fc9dbfee014a618566a824133ce24b3</originalsourceid><addsrcrecordid>eNp9kE1OwzAQhS0EEqVwAHZesiBh_NOkEStUtYBUqRtYW44zBrdpUmwHiWNxEc6Eo7JG8sij8XtP44-QawY5A1bcbfMYbM5Tm4PIYcZPyITNyyrjpWCnZAIgISuggnNyEcIWABjnYkJ2S2vRRNpbGt8xlTO7DkOgHpvBRNd3NJ3xKUSfBoPX7S0Ng7faINVdQ_f6rcPoDD34_oA-Ogxj2s93tkK-EWNkR61r9-GSnFndBrz6u6fkdbV8WTxl683j8-JhnRkhIGYS5ayUVckLzZksSlszKxo2qzUvq1pWRlhTNbVFBCZ1weazotBzLpkQBrmsxZTcHHPTRh8Dhqj2LhhsW91hPwTF5qxIoGQJScqOUuP7EDxadfBur_2XYqBGsGqrElg1glUgVAKbPPdHD6Y_fDr0KhiHncHG-YRSNb37x_0LormBjA</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>1816016470</pqid></control><display><type>article</type><title>Effect of the thickness reduction on the structural, surface and magnetic properties of α-Fe2O3 thin films</title><source>ScienceDirect Journals</source><creator>Aragón, Fermin F.H. ; Ardisson, José D. ; Aquino, Juan C.R. ; Gonzalez, Ismael ; Macedo, Waldemar A.A. ; Coaquira, José A.H. ; Mantilla, John ; da Silva, Sebastião W. ; Morais, Paulo C.</creator><creatorcontrib>Aragón, Fermin F.H. ; Ardisson, José D. ; Aquino, Juan C.R. ; Gonzalez, Ismael ; Macedo, Waldemar A.A. ; Coaquira, José A.H. ; Mantilla, John ; da Silva, Sebastião W. ; Morais, Paulo C.</creatorcontrib><description>Hematite (α-Fe2O3) polycrystalline thin films of different thicknesses were produced by thermal oxidation in air atmosphere from Fe metallic thin-films deposited by radio frequency (RF) sputtering technique. X-ray diffraction (XRD) patterns confirm the formation of hematite phase in all samples and indicate that the mean grain size decreases as the film thickness becomes thinner. Conversion electron Mössbauer spectroscopy (CEMS) spectra at room temperature show magnetic splitting (six line patterns). It is determined that the resonance peaks become broader and asymmetric as the film thickness decreases. This finding was associated with the structural disorder introduced by the thickness reduction. Magnetization as a function of the magnetic field curve obtained at 300K shows the presence of a weak-ferromagnetic contribution, which was assigned to the large density of decompensated spins at the films surface. From the magnetization vs. temperature curves it has been determined that the Morin transition temperature (TM) is shifted from ~240K to ~196K, meanwhile it becomes more broadened as the film thickness decreases. X-ray photoelectron spectroscopy (XPS) measurements show the presence of Fe2+ ions coexisting with Fe3+ ions whose population increases as the film becomes thinner. The density of chemisorbed oxygen increases as the film thickness is reduced in agreement with the results obtained from the other measurements in this work. •Hematite thin films with different thickness were deposited by RF sputtering technique.•X-ray diffraction patterns confirm the formation of hematite phase in all samples.•Hysteresis curve at 300K shows the presence of a weak-ferromagnetic phase.•XPS show the presence of Fe2+ ions coexisting with Fe3+ ions.</description><identifier>ISSN: 0040-6090</identifier><identifier>EISSN: 1879-2731</identifier><identifier>DOI: 10.1016/j.tsf.2016.03.052</identifier><language>eng</language><publisher>Elsevier B.V</publisher><subject>Film thickness ; Hematite ; Magnetization ; Morin transition temperature ; Mössabuer spectroscopy ; Oxygen vacancies ; Radio frequencies ; Reduction ; Rietveld refinement ; Solvents ; Thin films ; X-ray diffraction ; X-rays</subject><ispartof>Thin solid films, 2016-05, Vol.607, p.50-54</ispartof><rights>2016 Elsevier B.V.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c330t-4e45749726a21467fb1f3d15ba279b49c3fc9dbfee014a618566a824133ce24b3</citedby><cites>FETCH-LOGICAL-c330t-4e45749726a21467fb1f3d15ba279b49c3fc9dbfee014a618566a824133ce24b3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>Aragón, Fermin F.H.</creatorcontrib><creatorcontrib>Ardisson, José D.</creatorcontrib><creatorcontrib>Aquino, Juan C.R.</creatorcontrib><creatorcontrib>Gonzalez, Ismael</creatorcontrib><creatorcontrib>Macedo, Waldemar A.A.</creatorcontrib><creatorcontrib>Coaquira, José A.H.</creatorcontrib><creatorcontrib>Mantilla, John</creatorcontrib><creatorcontrib>da Silva, Sebastião W.</creatorcontrib><creatorcontrib>Morais, Paulo C.</creatorcontrib><title>Effect of the thickness reduction on the structural, surface and magnetic properties of α-Fe2O3 thin films</title><title>Thin solid films</title><description>Hematite (α-Fe2O3) polycrystalline thin films of different thicknesses were produced by thermal oxidation in air atmosphere from Fe metallic thin-films deposited by radio frequency (RF) sputtering technique. X-ray diffraction (XRD) patterns confirm the formation of hematite phase in all samples and indicate that the mean grain size decreases as the film thickness becomes thinner. Conversion electron Mössbauer spectroscopy (CEMS) spectra at room temperature show magnetic splitting (six line patterns). It is determined that the resonance peaks become broader and asymmetric as the film thickness decreases. This finding was associated with the structural disorder introduced by the thickness reduction. Magnetization as a function of the magnetic field curve obtained at 300K shows the presence of a weak-ferromagnetic contribution, which was assigned to the large density of decompensated spins at the films surface. From the magnetization vs. temperature curves it has been determined that the Morin transition temperature (TM) is shifted from ~240K to ~196K, meanwhile it becomes more broadened as the film thickness decreases. X-ray photoelectron spectroscopy (XPS) measurements show the presence of Fe2+ ions coexisting with Fe3+ ions whose population increases as the film becomes thinner. The density of chemisorbed oxygen increases as the film thickness is reduced in agreement with the results obtained from the other measurements in this work. •Hematite thin films with different thickness were deposited by RF sputtering technique.•X-ray diffraction patterns confirm the formation of hematite phase in all samples.•Hysteresis curve at 300K shows the presence of a weak-ferromagnetic phase.•XPS show the presence of Fe2+ ions coexisting with Fe3+ ions.</description><subject>Film thickness</subject><subject>Hematite</subject><subject>Magnetization</subject><subject>Morin transition temperature</subject><subject>Mössabuer spectroscopy</subject><subject>Oxygen vacancies</subject><subject>Radio frequencies</subject><subject>Reduction</subject><subject>Rietveld refinement</subject><subject>Solvents</subject><subject>Thin films</subject><subject>X-ray diffraction</subject><subject>X-rays</subject><issn>0040-6090</issn><issn>1879-2731</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNp9kE1OwzAQhS0EEqVwAHZesiBh_NOkEStUtYBUqRtYW44zBrdpUmwHiWNxEc6Eo7JG8sij8XtP44-QawY5A1bcbfMYbM5Tm4PIYcZPyITNyyrjpWCnZAIgISuggnNyEcIWABjnYkJ2S2vRRNpbGt8xlTO7DkOgHpvBRNd3NJ3xKUSfBoPX7S0Ng7faINVdQ_f6rcPoDD34_oA-Ogxj2s93tkK-EWNkR61r9-GSnFndBrz6u6fkdbV8WTxl683j8-JhnRkhIGYS5ayUVckLzZksSlszKxo2qzUvq1pWRlhTNbVFBCZ1weazotBzLpkQBrmsxZTcHHPTRh8Dhqj2LhhsW91hPwTF5qxIoGQJScqOUuP7EDxadfBur_2XYqBGsGqrElg1glUgVAKbPPdHD6Y_fDr0KhiHncHG-YRSNb37x_0LormBjA</recordid><startdate>20160531</startdate><enddate>20160531</enddate><creator>Aragón, Fermin F.H.</creator><creator>Ardisson, José D.</creator><creator>Aquino, Juan C.R.</creator><creator>Gonzalez, Ismael</creator><creator>Macedo, Waldemar A.A.</creator><creator>Coaquira, José A.H.</creator><creator>Mantilla, John</creator><creator>da Silva, Sebastião W.</creator><creator>Morais, Paulo C.</creator><general>Elsevier B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>20160531</creationdate><title>Effect of the thickness reduction on the structural, surface and magnetic properties of α-Fe2O3 thin films</title><author>Aragón, Fermin F.H. ; Ardisson, José D. ; Aquino, Juan C.R. ; Gonzalez, Ismael ; Macedo, Waldemar A.A. ; Coaquira, José A.H. ; Mantilla, John ; da Silva, Sebastião W. ; Morais, Paulo C.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c330t-4e45749726a21467fb1f3d15ba279b49c3fc9dbfee014a618566a824133ce24b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>Film thickness</topic><topic>Hematite</topic><topic>Magnetization</topic><topic>Morin transition temperature</topic><topic>Mössabuer spectroscopy</topic><topic>Oxygen vacancies</topic><topic>Radio frequencies</topic><topic>Reduction</topic><topic>Rietveld refinement</topic><topic>Solvents</topic><topic>Thin films</topic><topic>X-ray diffraction</topic><topic>X-rays</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Aragón, Fermin F.H.</creatorcontrib><creatorcontrib>Ardisson, José D.</creatorcontrib><creatorcontrib>Aquino, Juan C.R.</creatorcontrib><creatorcontrib>Gonzalez, Ismael</creatorcontrib><creatorcontrib>Macedo, Waldemar A.A.</creatorcontrib><creatorcontrib>Coaquira, José A.H.</creatorcontrib><creatorcontrib>Mantilla, John</creatorcontrib><creatorcontrib>da Silva, Sebastião W.</creatorcontrib><creatorcontrib>Morais, Paulo C.</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Thin solid films</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Aragón, Fermin F.H.</au><au>Ardisson, José D.</au><au>Aquino, Juan C.R.</au><au>Gonzalez, Ismael</au><au>Macedo, Waldemar A.A.</au><au>Coaquira, José A.H.</au><au>Mantilla, John</au><au>da Silva, Sebastião W.</au><au>Morais, Paulo C.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effect of the thickness reduction on the structural, surface and magnetic properties of α-Fe2O3 thin films</atitle><jtitle>Thin solid films</jtitle><date>2016-05-31</date><risdate>2016</risdate><volume>607</volume><spage>50</spage><epage>54</epage><pages>50-54</pages><issn>0040-6090</issn><eissn>1879-2731</eissn><abstract>Hematite (α-Fe2O3) polycrystalline thin films of different thicknesses were produced by thermal oxidation in air atmosphere from Fe metallic thin-films deposited by radio frequency (RF) sputtering technique. X-ray diffraction (XRD) patterns confirm the formation of hematite phase in all samples and indicate that the mean grain size decreases as the film thickness becomes thinner. Conversion electron Mössbauer spectroscopy (CEMS) spectra at room temperature show magnetic splitting (six line patterns). It is determined that the resonance peaks become broader and asymmetric as the film thickness decreases. This finding was associated with the structural disorder introduced by the thickness reduction. Magnetization as a function of the magnetic field curve obtained at 300K shows the presence of a weak-ferromagnetic contribution, which was assigned to the large density of decompensated spins at the films surface. From the magnetization vs. temperature curves it has been determined that the Morin transition temperature (TM) is shifted from ~240K to ~196K, meanwhile it becomes more broadened as the film thickness decreases. X-ray photoelectron spectroscopy (XPS) measurements show the presence of Fe2+ ions coexisting with Fe3+ ions whose population increases as the film becomes thinner. The density of chemisorbed oxygen increases as the film thickness is reduced in agreement with the results obtained from the other measurements in this work. •Hematite thin films with different thickness were deposited by RF sputtering technique.•X-ray diffraction patterns confirm the formation of hematite phase in all samples.•Hysteresis curve at 300K shows the presence of a weak-ferromagnetic phase.•XPS show the presence of Fe2+ ions coexisting with Fe3+ ions.</abstract><pub>Elsevier B.V</pub><doi>10.1016/j.tsf.2016.03.052</doi><tpages>5</tpages></addata></record>
fulltext fulltext
identifier ISSN: 0040-6090
ispartof Thin solid films, 2016-05, Vol.607, p.50-54
issn 0040-6090
1879-2731
language eng
recordid cdi_proquest_miscellaneous_1816016470
source ScienceDirect Journals
subjects Film thickness
Hematite
Magnetization
Morin transition temperature
Mössabuer spectroscopy
Oxygen vacancies
Radio frequencies
Reduction
Rietveld refinement
Solvents
Thin films
X-ray diffraction
X-rays
title Effect of the thickness reduction on the structural, surface and magnetic properties of α-Fe2O3 thin films
url http://sfxeu10.hosted.exlibrisgroup.com/loughborough?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2024-12-23T04%3A27%3A37IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_cross&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Effect%20of%20the%20thickness%20reduction%20on%20the%20structural,%20surface%20and%20magnetic%20properties%20of%20%CE%B1-Fe2O3%20thin%20films&rft.jtitle=Thin%20solid%20films&rft.au=Arag%C3%B3n,%20Fermin%20F.H.&rft.date=2016-05-31&rft.volume=607&rft.spage=50&rft.epage=54&rft.pages=50-54&rft.issn=0040-6090&rft.eissn=1879-2731&rft_id=info:doi/10.1016/j.tsf.2016.03.052&rft_dat=%3Cproquest_cross%3E1816016470%3C/proquest_cross%3E%3Cgrp_id%3Ecdi_FETCH-LOGICAL-c330t-4e45749726a21467fb1f3d15ba279b49c3fc9dbfee014a618566a824133ce24b3%3C/grp_id%3E%3Coa%3E%3C/oa%3E%3Curl%3E%3C/url%3E&rft_id=info:oai/&rft_pqid=1816016470&rft_id=info:pmid/&rfr_iscdi=true