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The system employs a wavelength-tunable (700\u20131000\u00a0nm), ultra-narrow-linewidth Ti:sapphire laser and achieves sub-micron spatial resolution. The wavelength-dependent MOKE measurements of Co20Fe60B20 (\u223c1\u00a0nm thick) heterostructures identify the optimal probe wavelength for SNS detection. At room temperature, spatially resolved spin-noise spectra reveal that magnetic noise arises primarily from domain-wall fluctuations, while noise inside domains is strongly suppressed. Temperature-dependent zero-field measurements across the spin reorientation transition reveal a suppression of low-frequency spin noise, reflecting the evolution of magnetic fluctuations as the magnetization rotates from out-of-plane to in-plane. This three-module SNS-MOKE platform enables magnetic-structure-selective studies of spin fluctuations in complex magnetic textures and provides a versatile framework for investigating fluctuation dynamics in two-dimensional magnetic materials, spin glasses, and artificial spin ice.<\/jats:p>","DOI":"10.1063\/5.0345028","type":"journal-article","created":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T12:50:43Z","timestamp":1790599843000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Development of a confocal spin-noise spectroscopy and magneto-optical Kerr effect imaging platform for probing magnetic fluctuations in two-dimensional magnetic heterostructures"],"prefix":"10.1063","volume":"97","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-0528-5953","authenticated-orcid":false,"given":"Gongling","family":"Chen","sequence":"first","affiliation":[{"name":"State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University 1 , Beijing 100084,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-2584-9483","authenticated-orcid":false,"given":"Pai","family":"Peng","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University 1 , Beijing 100084,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-2068-3812","authenticated-orcid":false,"given":"Tengyue","family":"Ma","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University 1 , Beijing 100084,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-2452-4229","authenticated-orcid":false,"given":"Shangjie","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University 1 , Beijing 100084,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-4146-6709","authenticated-orcid":false,"given":"Chih-Chieh","family":"Wu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University 1 , Beijing 100084,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5804-6245","authenticated-orcid":false,"given":"Le","family":"Zhao","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University 1 , Beijing 100084,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wanjun","family":"Jiang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University 1 , Beijing 100084,","place":["China"]},{"name":"Frontier Science Center for Quantum Information 2 , Beijing 100084,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6260-1395","authenticated-orcid":false,"given":"Luyi","family":"Yang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University 1 , Beijing 100084,","place":["China"]},{"name":"Frontier Science Center for Quantum Information 2 , Beijing 100084,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2026,9,28]]},"reference":[{"key":"2026092808503626200_c1","doi-asserted-by":"publisher","first-page":"49","DOI":"10.1038\/nature02804","article-title":"Spectroscopy of spontaneous spin noise as a probe of spin dynamics and magnetic resonance","volume":"431","year":"2004","journal-title":"Nature"},{"key":"2026092808503626200_c2","doi-asserted-by":"publisher","first-page":"063608","DOI":"10.1103\/physreva.74.063608","article-title":"Spin noise spectroscopy to probe quantum states of ultracold fermionic atom gases","volume":"74","year":"2006","journal-title":"Phys. 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