{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:WI3NS5ZFNDCRVRQRY7KEVJB6UM","short_pith_number":"pith:WI3NS5ZF","canonical_record":{"source":{"id":"1709.08690","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2017-09-25T19:29:06Z","cross_cats_sorted":[],"title_canon_sha256":"68d93d189cbe45d3e3891f0fa94f2c074025245d1052ee21cbfc103be4fc9c6e","abstract_canon_sha256":"e09a5c60441f269343e067f70bfb5f979931bee53467af7618f5e8424bbfcdad"},"schema_version":"1.0"},"canonical_sha256":"b236d9772568c51ac611c7d44aa43ea317d1feed42df5e126e325c63b72f5589","source":{"kind":"arxiv","id":"1709.08690","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1709.08690","created_at":"2026-05-18T00:34:22Z"},{"alias_kind":"arxiv_version","alias_value":"1709.08690v1","created_at":"2026-05-18T00:34:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1709.08690","created_at":"2026-05-18T00:34:22Z"},{"alias_kind":"pith_short_12","alias_value":"WI3NS5ZFNDCR","created_at":"2026-05-18T12:31:53Z"},{"alias_kind":"pith_short_16","alias_value":"WI3NS5ZFNDCRVRQR","created_at":"2026-05-18T12:31:53Z"},{"alias_kind":"pith_short_8","alias_value":"WI3NS5ZF","created_at":"2026-05-18T12:31:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:WI3NS5ZFNDCRVRQRY7KEVJB6UM","target":"record","payload":{"canonical_record":{"source":{"id":"1709.08690","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2017-09-25T19:29:06Z","cross_cats_sorted":[],"title_canon_sha256":"68d93d189cbe45d3e3891f0fa94f2c074025245d1052ee21cbfc103be4fc9c6e","abstract_canon_sha256":"e09a5c60441f269343e067f70bfb5f979931bee53467af7618f5e8424bbfcdad"},"schema_version":"1.0"},"canonical_sha256":"b236d9772568c51ac611c7d44aa43ea317d1feed42df5e126e325c63b72f5589","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:34:22.089188Z","signature_b64":"tIamaIrm/waAVlsEU33hrBQ5Cpo6pvCAomBCTvRxuZO6POVqyoYTStUEG34T9tN2BE+cEDfBezdtAW4D4EfFAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b236d9772568c51ac611c7d44aa43ea317d1feed42df5e126e325c63b72f5589","last_reissued_at":"2026-05-18T00:34:22.088768Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:34:22.088768Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1709.08690","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":"2026-05-18T00:34:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"d/TI/HWKxPdog0zQaqPDH4x6DoFOBtNAza8JrW89frKKMmknk4PXYNUaG3uFFMO27ZWsG3xZZBSnD/jOVq2kDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-21T10:34:20.068214Z"},"content_sha256":"bc88149e5a6b1be97f8786e2fdaff9fff590e11cbc9bdd77b7fc35e0502b242c","schema_version":"1.0","event_id":"sha256:bc88149e5a6b1be97f8786e2fdaff9fff590e11cbc9bdd77b7fc35e0502b242c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:WI3NS5ZFNDCRVRQRY7KEVJB6UM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Is perpendicular magnetic anisotropy essential to all-optical ultrafast spin reversal in ferromagnets?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"G. P. Zhang, Thomas F. George, Y. H. Bai","submitted_at":"2017-09-25T19:29:06Z","abstract_excerpt":"All-optical spin reversal presents a new opportunity for spin manipulations, free of a magnetic field. Most of all-optical-spin-reversal ferromagnets are found to have a perpendicular magnetic anisotropy (PMA), but it has been unknown whether PMA is necessary for the spin reversal. Here we theoretically investigate magnetic thin films with either PMA or in-plane magnetic anisotropy (IMA). Our results show that the spin reversal in IMA systems is possible, but only with a longer laser pulse and within a narrow laser parameter region. The spin reversal does not show a strong helicity dependence "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1709.08690","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":"2026-05-18T00:34:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"e2VfQJUi+pjfN0vqXY8/mCSou4EyAbKO0K/HKALHKknS0PYMW0ISM+DM+3daNU9qNd2oTlB5Z4b24v0c/HpjBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-21T10:34:20.068806Z"},"content_sha256":"1f7f3d3d4421294c3f173b6917c51864d8482e0e15020108a3c648733b72a9f0","schema_version":"1.0","event_id":"sha256:1f7f3d3d4421294c3f173b6917c51864d8482e0e15020108a3c648733b72a9f0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WI3NS5ZFNDCRVRQRY7KEVJB6UM/bundle.json","state_url":"https://pith.science/pith/WI3NS5ZFNDCRVRQRY7KEVJB6UM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WI3NS5ZFNDCRVRQRY7KEVJB6UM/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":"2026-05-21T10:34:20Z","links":{"resolver":"https://pith.science/pith/WI3NS5ZFNDCRVRQRY7KEVJB6UM","bundle":"https://pith.science/pith/WI3NS5ZFNDCRVRQRY7KEVJB6UM/bundle.json","state":"https://pith.science/pith/WI3NS5ZFNDCRVRQRY7KEVJB6UM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WI3NS5ZFNDCRVRQRY7KEVJB6UM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:WI3NS5ZFNDCRVRQRY7KEVJB6UM","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":"e09a5c60441f269343e067f70bfb5f979931bee53467af7618f5e8424bbfcdad","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2017-09-25T19:29:06Z","title_canon_sha256":"68d93d189cbe45d3e3891f0fa94f2c074025245d1052ee21cbfc103be4fc9c6e"},"schema_version":"1.0","source":{"id":"1709.08690","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1709.08690","created_at":"2026-05-18T00:34:22Z"},{"alias_kind":"arxiv_version","alias_value":"1709.08690v1","created_at":"2026-05-18T00:34:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1709.08690","created_at":"2026-05-18T00:34:22Z"},{"alias_kind":"pith_short_12","alias_value":"WI3NS5ZFNDCR","created_at":"2026-05-18T12:31:53Z"},{"alias_kind":"pith_short_16","alias_value":"WI3NS5ZFNDCRVRQR","created_at":"2026-05-18T12:31:53Z"},{"alias_kind":"pith_short_8","alias_value":"WI3NS5ZF","created_at":"2026-05-18T12:31:53Z"}],"graph_snapshots":[{"event_id":"sha256:1f7f3d3d4421294c3f173b6917c51864d8482e0e15020108a3c648733b72a9f0","target":"graph","created_at":"2026-05-18T00:34:22Z","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":"All-optical spin reversal presents a new opportunity for spin manipulations, free of a magnetic field. Most of all-optical-spin-reversal ferromagnets are found to have a perpendicular magnetic anisotropy (PMA), but it has been unknown whether PMA is necessary for the spin reversal. Here we theoretically investigate magnetic thin films with either PMA or in-plane magnetic anisotropy (IMA). Our results show that the spin reversal in IMA systems is possible, but only with a longer laser pulse and within a narrow laser parameter region. The spin reversal does not show a strong helicity dependence ","authors_text":"G. P. Zhang, Thomas F. George, Y. H. Bai","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2017-09-25T19:29:06Z","title":"Is perpendicular magnetic anisotropy essential to all-optical ultrafast spin reversal in ferromagnets?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1709.08690","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:bc88149e5a6b1be97f8786e2fdaff9fff590e11cbc9bdd77b7fc35e0502b242c","target":"record","created_at":"2026-05-18T00:34:22Z","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":"e09a5c60441f269343e067f70bfb5f979931bee53467af7618f5e8424bbfcdad","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2017-09-25T19:29:06Z","title_canon_sha256":"68d93d189cbe45d3e3891f0fa94f2c074025245d1052ee21cbfc103be4fc9c6e"},"schema_version":"1.0","source":{"id":"1709.08690","kind":"arxiv","version":1}},"canonical_sha256":"b236d9772568c51ac611c7d44aa43ea317d1feed42df5e126e325c63b72f5589","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b236d9772568c51ac611c7d44aa43ea317d1feed42df5e126e325c63b72f5589","first_computed_at":"2026-05-18T00:34:22.088768Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:34:22.088768Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tIamaIrm/waAVlsEU33hrBQ5Cpo6pvCAomBCTvRxuZO6POVqyoYTStUEG34T9tN2BE+cEDfBezdtAW4D4EfFAg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:34:22.089188Z","signed_message":"canonical_sha256_bytes"},"source_id":"1709.08690","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bc88149e5a6b1be97f8786e2fdaff9fff590e11cbc9bdd77b7fc35e0502b242c","sha256:1f7f3d3d4421294c3f173b6917c51864d8482e0e15020108a3c648733b72a9f0"],"state_sha256":"cbae0f07e6303cfdbae2ef10b9302815bbbe4cb2478c72c2a8ef03a12caddfb5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GXdankSX+FngNSLbtR3NBNdAb/Zvq7vNFwcUXWMPMkmShQvZhvnLc7m3OH4P5eMDSuGs328QqSjuz0acFR3ZCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-21T10:34:20.072182Z","bundle_sha256":"7102d75c454ba3d8783177cf22d3d4ffa33a4cf3952dfd96c1702eaee8e445c4"}}