{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:BVMD54B2KTCGPHWWKGSPSUMFRY","short_pith_number":"pith:BVMD54B2","canonical_record":{"source":{"id":"0907.2902","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.other","submitted_at":"2009-07-16T18:58:59Z","cross_cats_sorted":[],"title_canon_sha256":"11a569582c977e9f1eb94e24aac9af45950ef787f422370131169cc51d51a28b","abstract_canon_sha256":"a9f1fbecd0dd7abed1f413b1dd4b4140e9411de29129e6a48d03a5ea67b657bb"},"schema_version":"1.0"},"canonical_sha256":"0d583ef03a54c4679ed651a4f951858e36267a1df7e376e07b3580c2c42086e5","source":{"kind":"arxiv","id":"0907.2902","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0907.2902","created_at":"2026-05-18T04:18:53Z"},{"alias_kind":"arxiv_version","alias_value":"0907.2902v1","created_at":"2026-05-18T04:18:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0907.2902","created_at":"2026-05-18T04:18:53Z"},{"alias_kind":"pith_short_12","alias_value":"BVMD54B2KTCG","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"BVMD54B2KTCGPHWW","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"BVMD54B2","created_at":"2026-05-18T12:25:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:BVMD54B2KTCGPHWWKGSPSUMFRY","target":"record","payload":{"canonical_record":{"source":{"id":"0907.2902","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.other","submitted_at":"2009-07-16T18:58:59Z","cross_cats_sorted":[],"title_canon_sha256":"11a569582c977e9f1eb94e24aac9af45950ef787f422370131169cc51d51a28b","abstract_canon_sha256":"a9f1fbecd0dd7abed1f413b1dd4b4140e9411de29129e6a48d03a5ea67b657bb"},"schema_version":"1.0"},"canonical_sha256":"0d583ef03a54c4679ed651a4f951858e36267a1df7e376e07b3580c2c42086e5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:18:53.400748Z","signature_b64":"kUi5N29t9u2U9lPgH4FnqOwKC99IkU36fGXHb8ueuDBF+Bn0buIeezIZt7OdC/aC5Spt16WOitKnToQO7BFmDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0d583ef03a54c4679ed651a4f951858e36267a1df7e376e07b3580c2c42086e5","last_reissued_at":"2026-05-18T04:18:53.400206Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:18:53.400206Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0907.2902","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T04:18:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xovhRAUxKogi9TiyDQ+Cvmfm7dYgUnJ9eS+K0dH1MqY1fqlkJmNVargi/qg+Mo1TuueoKtURnAGwUQGx5lHVCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T05:33:01.572730Z"},"content_sha256":"29ba37eddc20b3d688a80ed395c5bf5242eeb72ecc2bf14827558a419a0e77f7","schema_version":"1.0","event_id":"sha256:29ba37eddc20b3d688a80ed395c5bf5242eeb72ecc2bf14827558a419a0e77f7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:BVMD54B2KTCGPHWWKGSPSUMFRY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Reverse Doppler effect in backward spin waves scattered on acoustic waves","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.other","authors_text":"A. A. Serga, A. Jander, A. V. Chumak, B. Hillebrands, P. Dhagat","submitted_at":"2009-07-16T18:58:59Z","abstract_excerpt":"We report on the observation of reverse Doppler effect in backward spin waves reflected off of surface acoustic waves. The spin waves are excited in a yttrium iron garnet (YIG) film. Simultaneously, acoustic waves are also generated. The strain induced by the acoustic waves in the magnetostrictive YIG film results in the periodic modulation of the magnetic anisotropy in the film. Thus, in effect, a travelling Bragg grating for the spin waves is produced. The backward spin waves reflecting off of this grating exhibit a reverse Doppler shift: shifting down rather than up in frequency when reflec"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0907.2902","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T04:18:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ts9GwnDkiGb2nFuTATOTPS5nJNJqw66Zo8OPoJEfL8WlkaraeMPH2zP+cQ0ahUWUX03PEk4v3jWVZKl2Zyk/Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T05:33:01.573143Z"},"content_sha256":"0a0af5387fa56bd521e73430b420943d3d28ef897c26f881dee1ce83d1f9bcdb","schema_version":"1.0","event_id":"sha256:0a0af5387fa56bd521e73430b420943d3d28ef897c26f881dee1ce83d1f9bcdb"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BVMD54B2KTCGPHWWKGSPSUMFRY/bundle.json","state_url":"https://pith.science/pith/BVMD54B2KTCGPHWWKGSPSUMFRY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BVMD54B2KTCGPHWWKGSPSUMFRY/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-27T05:33:01Z","links":{"resolver":"https://pith.science/pith/BVMD54B2KTCGPHWWKGSPSUMFRY","bundle":"https://pith.science/pith/BVMD54B2KTCGPHWWKGSPSUMFRY/bundle.json","state":"https://pith.science/pith/BVMD54B2KTCGPHWWKGSPSUMFRY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BVMD54B2KTCGPHWWKGSPSUMFRY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:BVMD54B2KTCGPHWWKGSPSUMFRY","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"a9f1fbecd0dd7abed1f413b1dd4b4140e9411de29129e6a48d03a5ea67b657bb","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.other","submitted_at":"2009-07-16T18:58:59Z","title_canon_sha256":"11a569582c977e9f1eb94e24aac9af45950ef787f422370131169cc51d51a28b"},"schema_version":"1.0","source":{"id":"0907.2902","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0907.2902","created_at":"2026-05-18T04:18:53Z"},{"alias_kind":"arxiv_version","alias_value":"0907.2902v1","created_at":"2026-05-18T04:18:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0907.2902","created_at":"2026-05-18T04:18:53Z"},{"alias_kind":"pith_short_12","alias_value":"BVMD54B2KTCG","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"BVMD54B2KTCGPHWW","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"BVMD54B2","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:0a0af5387fa56bd521e73430b420943d3d28ef897c26f881dee1ce83d1f9bcdb","target":"graph","created_at":"2026-05-18T04:18:53Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We report on the observation of reverse Doppler effect in backward spin waves reflected off of surface acoustic waves. The spin waves are excited in a yttrium iron garnet (YIG) film. Simultaneously, acoustic waves are also generated. The strain induced by the acoustic waves in the magnetostrictive YIG film results in the periodic modulation of the magnetic anisotropy in the film. Thus, in effect, a travelling Bragg grating for the spin waves is produced. The backward spin waves reflecting off of this grating exhibit a reverse Doppler shift: shifting down rather than up in frequency when reflec","authors_text":"A. A. Serga, A. Jander, A. V. Chumak, B. Hillebrands, P. Dhagat","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.other","submitted_at":"2009-07-16T18:58:59Z","title":"Reverse Doppler effect in backward spin waves scattered on acoustic waves"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0907.2902","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:29ba37eddc20b3d688a80ed395c5bf5242eeb72ecc2bf14827558a419a0e77f7","target":"record","created_at":"2026-05-18T04:18:53Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"a9f1fbecd0dd7abed1f413b1dd4b4140e9411de29129e6a48d03a5ea67b657bb","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.other","submitted_at":"2009-07-16T18:58:59Z","title_canon_sha256":"11a569582c977e9f1eb94e24aac9af45950ef787f422370131169cc51d51a28b"},"schema_version":"1.0","source":{"id":"0907.2902","kind":"arxiv","version":1}},"canonical_sha256":"0d583ef03a54c4679ed651a4f951858e36267a1df7e376e07b3580c2c42086e5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0d583ef03a54c4679ed651a4f951858e36267a1df7e376e07b3580c2c42086e5","first_computed_at":"2026-05-18T04:18:53.400206Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:18:53.400206Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"kUi5N29t9u2U9lPgH4FnqOwKC99IkU36fGXHb8ueuDBF+Bn0buIeezIZt7OdC/aC5Spt16WOitKnToQO7BFmDw==","signature_status":"signed_v1","signed_at":"2026-05-18T04:18:53.400748Z","signed_message":"canonical_sha256_bytes"},"source_id":"0907.2902","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:29ba37eddc20b3d688a80ed395c5bf5242eeb72ecc2bf14827558a419a0e77f7","sha256:0a0af5387fa56bd521e73430b420943d3d28ef897c26f881dee1ce83d1f9bcdb"],"state_sha256":"157af598132f4aefbd10bb52e9136df58c24fc7830d2ee0659dcef01fe09cd42"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lLrl+345//QW/rYv5HqreMHwZA52MAeiUle0SSHKCLcOjVwrWSptb95epHmP2WluOPZi3WHGVVc2EfbA1yyICg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T05:33:01.576066Z","bundle_sha256":"17e988ea0298ff787047c51ea71e29e66c7c05aa9bf54d7f92259191bbb49997"}}