| Magnetic response in the vicinity of magnetic compensation: a case study in spin ferromagnetic Sm(1 - x)Gd(x)Al(2) intermetallic alloys. | |
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MedLine Citation:
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PMID: 21406788 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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A compensated magnetic state in an ideally homogeneous system with long range magnetic order is characterized by a net zero magnetization (M) throughout the sample (macroscopic). In the pristine state of the sample (i.e. with no external field, H = 0), this implies that at the magnetic compensation temperature (T(comp)) we must have M = 0 at H = 0 irrespective of any thermal and magnetic history of the sample and any underlying physics. This simple fact voids the usual identification (and interpretation) of M-H loop parameters at and in the vicinity of magnetic compensation temperature, specifically the coercivity, the remanence, and the exchange bias characteristics. The physics of coercivity and exchange bias continues to be fully relevant, but its manifestation in an M-H loop would get camouflaged at (and near) a magnetic compensation because [Formula: see text] at H = 0. We present an experimental elucidation of the above premise through a case study in the spin ferromagnetic Sm(1 - x)Gd(x)Al(2) alloys [x = 0.01-0.06], where the specimens with x ≤ 0.03 show compensation below the Curie temperature T(c), while those with x ≥ 0.03 have rather small magnetization due to near cancellation of opposing contributions, but are otherwise devoid of compensation. The experiments comprised low field (near zero) as well as high field (70 kOe) magnetization measurements from the paramagnetic state down to 5 K in the ordered regime (T(c) ∼ 125 K) and isothermal M-H loop studies on the remnant magnetic state of polycrystalline samples. |
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Authors:
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S Venkatesh; Ulhas Vaidya; Veer Chand Rakhecha; S Ramakrishnan; A K Grover |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2010-11-19 |
Journal Detail:
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Title: Journal of physics. Condensed matter : an Institute of Physics journal Volume: 22 ISSN: 0953-8984 ISO Abbreviation: - Publication Date: 2010 Nov |
Date Detail:
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Created Date: 2011-3-16 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101165248 Medline TA: J Phys Condens Matter Country: - |
Other Details:
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Languages: ENG Pagination: 496002 Citation Subset: - |
Affiliation:
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Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Colaba, Mumbai 400005, India. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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