{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:IFRJBTEHGMEKFOY3GXHMYJRRHL","short_pith_number":"pith:IFRJBTEH","canonical_record":{"source":{"id":"1812.05766","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-12-14T03:14:11Z","cross_cats_sorted":[],"title_canon_sha256":"f49fc8d31a70e1d9d6d1d504c9995fb44692f7705ce85f75211fd10052bb7d46","abstract_canon_sha256":"7caeef5791e93d5d950b8b98043b5dfa3eadd7ca8a35b4318891834b638c29b0"},"schema_version":"1.0"},"canonical_sha256":"416290cc873308a2bb1b35cecc26313af96df0bebce4b9953b62a3302faa4e86","source":{"kind":"arxiv","id":"1812.05766","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1812.05766","created_at":"2026-05-17T23:48:31Z"},{"alias_kind":"arxiv_version","alias_value":"1812.05766v2","created_at":"2026-05-17T23:48:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1812.05766","created_at":"2026-05-17T23:48:31Z"},{"alias_kind":"pith_short_12","alias_value":"IFRJBTEHGMEK","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_16","alias_value":"IFRJBTEHGMEKFOY3","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_8","alias_value":"IFRJBTEH","created_at":"2026-05-18T12:32:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:IFRJBTEHGMEKFOY3GXHMYJRRHL","target":"record","payload":{"canonical_record":{"source":{"id":"1812.05766","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-12-14T03:14:11Z","cross_cats_sorted":[],"title_canon_sha256":"f49fc8d31a70e1d9d6d1d504c9995fb44692f7705ce85f75211fd10052bb7d46","abstract_canon_sha256":"7caeef5791e93d5d950b8b98043b5dfa3eadd7ca8a35b4318891834b638c29b0"},"schema_version":"1.0"},"canonical_sha256":"416290cc873308a2bb1b35cecc26313af96df0bebce4b9953b62a3302faa4e86","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:48:31.187760Z","signature_b64":"ncjwuRzIfEa706ySLsmYsDfkYpcLsWISlOhs7COHHxNMV3AAwIjR8uq8kz3vzznLKa96JL2GdhfOarUgxEYaBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"416290cc873308a2bb1b35cecc26313af96df0bebce4b9953b62a3302faa4e86","last_reissued_at":"2026-05-17T23:48:31.187154Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:48:31.187154Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1812.05766","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:48:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3D6VU8erueKTowmHVkbvhanGMNZ0k6scOe+6FXPqt3eL9DOr3vaWb6BR+CpwwQFOH+YKsxC9NEbTyT9eeVokAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T06:17:09.469470Z"},"content_sha256":"c88a00b7707920de690aedc3d81bdf59076a0a478378d49a7265cba7cd616bc8","schema_version":"1.0","event_id":"sha256:c88a00b7707920de690aedc3d81bdf59076a0a478378d49a7265cba7cd616bc8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:IFRJBTEHGMEKFOY3GXHMYJRRHL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Analytic Expression for Magnetic Activation Energy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Akimasa Sakuma, Daisuke Miura","submitted_at":"2018-12-14T03:14:11Z","abstract_excerpt":"We theoretically investigate the magnetic activation energy of permanent magnets. Practically, it is widely used in a phenomenological form as $\\mathcal{F}_\\mathrm{B}(H_\\mathrm{ext})=\\mathcal{F}_\\mathrm{B}^0\\left(1-H_\\mathrm{ext}/H_0\\right)^n,$ where $\\mathcal{F}_\\mathrm{B}^0$ is the activation energy in the absence of an external magnetic field $H_\\mathrm{ext}$, $n$ is a real parameter, and $H_0$ is defined by the equation $\\mathcal{F}_\\mathrm{B}(H_0)=0$. We derive the general and direct expressions for these phenomenological parameters under the restriction of uniform rotation of magnetizati"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1812.05766","kind":"arxiv","version":2},"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":"2026-05-17T23:48:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"iu+CwjfhLWLF/7rhRE9X4E4+Ugx0fqBfuYt+KNSkZT90YPfFotlUfMObLGpbhCPacBDqz9vAp6TTza5GPZ6bDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T06:17:09.469879Z"},"content_sha256":"024da0c265dae4a505afbda554e650698640381e2c542ed4f70b724de08c8a21","schema_version":"1.0","event_id":"sha256:024da0c265dae4a505afbda554e650698640381e2c542ed4f70b724de08c8a21"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IFRJBTEHGMEKFOY3GXHMYJRRHL/bundle.json","state_url":"https://pith.science/pith/IFRJBTEHGMEKFOY3GXHMYJRRHL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IFRJBTEHGMEKFOY3GXHMYJRRHL/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":"2026-06-23T06:17:09Z","links":{"resolver":"https://pith.science/pith/IFRJBTEHGMEKFOY3GXHMYJRRHL","bundle":"https://pith.science/pith/IFRJBTEHGMEKFOY3GXHMYJRRHL/bundle.json","state":"https://pith.science/pith/IFRJBTEHGMEKFOY3GXHMYJRRHL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IFRJBTEHGMEKFOY3GXHMYJRRHL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:IFRJBTEHGMEKFOY3GXHMYJRRHL","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":"7caeef5791e93d5d950b8b98043b5dfa3eadd7ca8a35b4318891834b638c29b0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-12-14T03:14:11Z","title_canon_sha256":"f49fc8d31a70e1d9d6d1d504c9995fb44692f7705ce85f75211fd10052bb7d46"},"schema_version":"1.0","source":{"id":"1812.05766","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1812.05766","created_at":"2026-05-17T23:48:31Z"},{"alias_kind":"arxiv_version","alias_value":"1812.05766v2","created_at":"2026-05-17T23:48:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1812.05766","created_at":"2026-05-17T23:48:31Z"},{"alias_kind":"pith_short_12","alias_value":"IFRJBTEHGMEK","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_16","alias_value":"IFRJBTEHGMEKFOY3","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_8","alias_value":"IFRJBTEH","created_at":"2026-05-18T12:32:28Z"}],"graph_snapshots":[{"event_id":"sha256:024da0c265dae4a505afbda554e650698640381e2c542ed4f70b724de08c8a21","target":"graph","created_at":"2026-05-17T23:48:31Z","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 theoretically investigate the magnetic activation energy of permanent magnets. Practically, it is widely used in a phenomenological form as $\\mathcal{F}_\\mathrm{B}(H_\\mathrm{ext})=\\mathcal{F}_\\mathrm{B}^0\\left(1-H_\\mathrm{ext}/H_0\\right)^n,$ where $\\mathcal{F}_\\mathrm{B}^0$ is the activation energy in the absence of an external magnetic field $H_\\mathrm{ext}$, $n$ is a real parameter, and $H_0$ is defined by the equation $\\mathcal{F}_\\mathrm{B}(H_0)=0$. We derive the general and direct expressions for these phenomenological parameters under the restriction of uniform rotation of magnetizati","authors_text":"Akimasa Sakuma, Daisuke Miura","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-12-14T03:14:11Z","title":"Analytic Expression for Magnetic Activation Energy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1812.05766","kind":"arxiv","version":2},"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:c88a00b7707920de690aedc3d81bdf59076a0a478378d49a7265cba7cd616bc8","target":"record","created_at":"2026-05-17T23:48:31Z","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":"7caeef5791e93d5d950b8b98043b5dfa3eadd7ca8a35b4318891834b638c29b0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-12-14T03:14:11Z","title_canon_sha256":"f49fc8d31a70e1d9d6d1d504c9995fb44692f7705ce85f75211fd10052bb7d46"},"schema_version":"1.0","source":{"id":"1812.05766","kind":"arxiv","version":2}},"canonical_sha256":"416290cc873308a2bb1b35cecc26313af96df0bebce4b9953b62a3302faa4e86","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"416290cc873308a2bb1b35cecc26313af96df0bebce4b9953b62a3302faa4e86","first_computed_at":"2026-05-17T23:48:31.187154Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:48:31.187154Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ncjwuRzIfEa706ySLsmYsDfkYpcLsWISlOhs7COHHxNMV3AAwIjR8uq8kz3vzznLKa96JL2GdhfOarUgxEYaBA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:48:31.187760Z","signed_message":"canonical_sha256_bytes"},"source_id":"1812.05766","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c88a00b7707920de690aedc3d81bdf59076a0a478378d49a7265cba7cd616bc8","sha256:024da0c265dae4a505afbda554e650698640381e2c542ed4f70b724de08c8a21"],"state_sha256":"9e3ece274f492369b70c92719464f04e1ef1de44c9a665bfc86f55d930a4063d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lmK/H+1ouQVd5/ENqy03Fs+uwa+ZitSnVLJ5PA0XPZ3vcJc6wljWwoARjWNv8ZMNQTQz8imWNrPzpmiJNOdCCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-23T06:17:09.471792Z","bundle_sha256":"f4ca6251f5f69e57c20c78134ec49f21279ab351b7d3026c57ef246be6566859"}}