{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,7,8]],"date-time":"2025-07-08T10:06:50Z","timestamp":1751969210789},"reference-count":13,"publisher":"AIP Publishing","issue":"10","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2003,5,15]]},"abstract":"<jats:p>We present a magnetic study of Fe-doped diureasils (siloxane-based networks to which poly(ethylene oxide)-based chains are grafted by urea cross linkages doped with Fe(II) or Fe(III) ions. Structural studies show that the Fe(II) ions interact mainly with the organic chain, whereas the incorporation of Fe(III) leads to the formation of iron-based nanoclusters, with radius increasing from 20 to 40 \u00c5. Fe(II)-doped samples behave as simple paramagnets, with \u03bceff=5.32\u200a\u03bcB. Fe(III)-doped hybrids present antiferromagnetic interactions, with TN increasing with Fe(III) concentration up to 13.6 K for 6% doping. Thermal irreversibility was observed below \u223c40 K and is stronger for higher concentrations. The coercive fields (HC) are of the order of 1000 Oe at 5 K. Hysteresis cycles are shifted to negative fields, revealing the presence of exchange anisotropy interactions with exchange fields (HE) of the order of 100 Oe. Both fields decrease rapidly with increasing temperature. We analyze this behavior in terms of the contribution of surface spin disorder to exchange anisotropy.<\/jats:p>","DOI":"10.1063\/1.1556163","type":"journal-article","created":{"date-parts":[[2003,5,15]],"date-time":"2003-05-15T23:33:55Z","timestamp":1053041635000},"page":"6978-6980","update-policy":"http:\/\/dx.doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":14,"title":["Magnetic properties of Fe-doped organic\u2013inorganic nanohybrids"],"prefix":"10.1063","volume":"93","author":[{"given":"N. J. O.","family":"Silva","sequence":"first","affiliation":[{"name":"Departamento de F\u0131\u0301sica and CICECO, Universidade de Aveiro, 3810-193\u2009Aveiro, Portugal"}]},{"given":"V. S.","family":"Amaral","sequence":"additional","affiliation":[{"name":"Departamento de F\u0131\u0301sica and CICECO, Universidade de Aveiro, 3810-193\u2009Aveiro, Portugal"}]},{"given":"L. D.","family":"Carlos","sequence":"additional","affiliation":[{"name":"Departamento de F\u0131\u0301sica and CICECO, Universidade de Aveiro, 3810-193\u2009Aveiro, Portugal"}]},{"given":"V.","family":"de Zea Bermudez","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u0131\u0301mica, Universidade de Tr\u00e1s-os-Montes e Alto Douro, 5001-911\u2009Vila Real, Portugal"}]}],"member":"317","reference":[{"key":"2024021105003200800_r1","doi-asserted-by":"crossref","first-page":"35","DOI":"10.1039\/a805538f","volume":"9","year":"1999","journal-title":"J. Mater. Chem."},{"key":"2024021105003200800_r2","doi-asserted-by":"crossref","first-page":"1677","DOI":"10.1039\/a701836c","volume":"7","year":"1997","journal-title":"J. Mater. Chem."},{"key":"2024021105003200800_r3","doi-asserted-by":"crossref","first-page":"594","DOI":"10.1002\/(SICI)1521-4095(200004)12:8<594::AID-ADMA594>3.0.CO;2-S","volume":"12","year":"2000","journal-title":"Adv. Mater."},{"key":"2024021105003200800_r3a","doi-asserted-by":"crossref","first-page":"10042","DOI":"10.1103\/PhysRevB.60.10042","volume":"60","year":"1999","journal-title":"Phys. Rev. B"},{"key":"2024021105003200800_r4","doi-asserted-by":"crossref","first-page":"4937","DOI":"10.1021\/jp984605h","volume":"103","year":"1999","journal-title":"J. Phys. Chem. B"},{"key":"2024021105003200800_r4a","doi-asserted-by":"crossref","first-page":"3249","DOI":"10.1039\/b104822h","volume":"11","year":"2001","journal-title":"J. Mater. Chem."},{"key":"2024021105003200800_r5","doi-asserted-by":"crossref","first-page":"2935","DOI":"10.1109\/20.951352","volume":"37","year":"2001","journal-title":"IEEE Trans. Magn."},{"key":"2024021105003200800_r6","first-page":"Q6","volume":"726","year":"2002","journal-title":"Mater. Res. Soc. Symp. Proc."},{"key":"2024021105003200800_r7"},{"key":"2024021105003200800_r8","doi-asserted-by":"crossref","first-page":"181","DOI":"10.1103\/PhysRevLett.80.181","volume":"80","year":"1998","journal-title":"Phys. Rev. Lett."},{"key":"2024021105003200800_r9","doi-asserted-by":"crossref","first-page":"394","DOI":"10.1103\/PhysRevLett.77.394","volume":"77","year":"1996","journal-title":"Phys. Rev. Lett."},{"key":"2024021105003200800_r9a","doi-asserted-by":"crossref","first-page":"5552","DOI":"10.1063\/1.364659","volume":"81","year":"1997","journal-title":"J. Appl. Phys."},{"key":"2024021105003200800_r10","doi-asserted-by":"crossref","first-page":"6321","DOI":"10.1103\/PhysRevB.59.6321","volume":"59","year":"1999","journal-title":"Phys. Rev. B"}],"container-title":["Journal of Applied Physics"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/pubs.aip.org\/aip\/jap\/article-pdf\/93\/10\/6978\/19069067\/6978_1_online.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"syndication"},{"URL":"https:\/\/pubs.aip.org\/aip\/jap\/article-pdf\/93\/10\/6978\/19069067\/6978_1_online.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2024,2,11]],"date-time":"2024-02-11T05:00:43Z","timestamp":1707627643000},"score":1,"resource":{"primary":{"URL":"https:\/\/pubs.aip.org\/jap\/article\/93\/10\/6978\/893127\/Magnetic-properties-of-Fe-doped-organic-inorganic"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2003,5,15]]},"references-count":13,"journal-issue":{"issue":"10","published-print":{"date-parts":[[2003,5,15]]}},"URL":"https:\/\/doi.org\/10.1063\/1.1556163","relation":{},"ISSN":["0021-8979","1089-7550"],"issn-type":[{"value":"0021-8979","type":"print"},{"value":"1089-7550","type":"electronic"}],"subject":[],"published-other":{"date-parts":[[2003,5,15]]},"published":{"date-parts":[[2003,5,15]]}}}